Investment Risks |
Dec. 31, 2025 |
|---|---|
| Guinness Atkinson Alternative Energy Fund | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of the Alternative Energy Fund and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Alternative Energy Fund | Industry Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Industry Risks. Prices of energy, whether traditional or sustainable, may fluctuate or decline due to many factors, including international political or economic developments, real or perceived, demand for energy and sustainable energy, production and distribution policies of OPEC (Organization of Petroleum Exporting Countries) and other oil-producing countries, energy conservation projects, changes in governmental regulations affecting companies in the energy business or related lines of business, including Sustainable Energy companies, changes in technology affecting alternative or sustainable energy, and changes in tax regulations relating to energy. A decline in energy prices would likely have a negative effect on securities held by the Fund. The Fund’s focus on sustainable energy businesses exposes the Fund to greater market risk and potential monetary losses than if the Fund’s assets were diversified among various industries or sectors. |
| Guinness Atkinson Alternative Energy Fund | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Alternative Energy Fund | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Alternative Energy Fund | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants is uncertain and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Alternative Energy Fund | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy , such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. European Securities. The Fund may invest in companies in Europe and the United Kingdom. Companies in countries in the European Union may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and South Korea. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. Countries in Asia may be more dependent on global trade relationships; interruptions in global trade could adversely affect securities of companies in Asia. • Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect the Fund’s investments. China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. South Korea. South Korea’s economy is sensitive to changes in international trade, and could be adversely affected if there is a downturn in export markets globally. Substantial political tensions exist between North Korea and South Korea. South Korea’s economy and South Korean companies could be adversely affected by increases in tension between North Korea and South Korea. |
| Guinness Atkinson Alternative Energy Fund | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as South Korea (Won), Taiwan (New Taiwan Dollar), Singapore (Singapore Dollar) and India (Rupee), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Alternative Energy Fund | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Alternative Energy Fund | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Alternative Energy Fund | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Alternative Energy Fund | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund’s strategy may not achieve its investment objective; portfolio manager judgments about securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Alternative Energy Fund | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap. Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Alternative Energy Fund | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with each Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold with seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Alternative Energy Fund | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Asia Focus Fund | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of the Asia Focus Fund and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Asia Focus Fund | Geographic Focus Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Geographic Focus Risk. The Fund’s investments are concentrated in the Asia region excluding Japan, and therefore, the Fund’s portfolio holdings may be more sensitive to social, political and economic conditions in Asia than a Fund with a more geographically diverse investment portfolio. |
| Guinness Atkinson Asia Focus Fund | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Asia Focus Fund | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Asia Focus Fund | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Asia Focus Fund | Risks of Investing in Asia Pacific Securities [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks of Investing in Asia Pacific Securities. Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect the Fund’s investments. Australia. Australia’s economy is more dependent than others on exports, especially in commodities, and key trading relationships with the US, China, Japan, Singapore, the UK and other European countries. Reduction in demand for commodities and services could adversely affect companies in Australia. China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. Hong Kong. Hong Kong companies could be adversely affected by changes in Hong Kong’s relationship with China, of which Hong Kong is a special administrative district. Recent changes in the political and legal structure in Hong Kong (but not the economic structure) could adversely affect companies in Hong Kong. Global reaction to China’s actions with respect to Hong Kong could also adversely affect the Fund’s investments in companies economically tied to Hong Kong. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to Hong Kong. Singapore. Singapore’s economy relies heavily on exports and trade relationships with other countries. Singapore companies could be adversely affected by changes in its relationships with other countries in the Asia-Pacific region, as well as economic or political developments in other Asian nations that are key trading partners of Singapore. Taiwan. Taiwan’s economy is more sensitive than others to changes in exports and global trading, and to tensions in Taiwan’s relationship with China. Taiwan is more dependent than other countries on imports of raw materials. Tensions between Taiwan and China over Taiwan’s independence could materially adversely affect companies in Taiwan. |
| Guinness Atkinson Asia Focus Fund | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy , such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Asia Focus Fund | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as South Korea (Won), Taiwan (New Taiwan Dollar), Singapore (Singapore Dollar) and India (Rupee), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Asia Focus Fund | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Asia Focus Fund | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Asia Focus Fund | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Asia Focus Fund | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund’s strategy may not achieve its investment objective; portfolio manager judgments about securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Asia Focus Fund | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap. Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Asia Focus Fund | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with each Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold with seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Asia Focus Fund | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. For more information on the risks of investing in this Fund, please see the Principal Risks, Risks of Investing in Asia, and Risks of Investing in Our Funds in the prospectus. You may also refer to the section Risk Factors and Special Considerations in the Statement of Additional Information. |
| Guinness Atkinson China & Hong Kong Fund | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of the China & Hong Kong Fund and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson China & Hong Kong Fund | Geographic Focus Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Geographic Focus Risk. The Fund’s investments are concentrated in companies that are economically tied to China and Hong Kong. The Fund’s portfolio holdings may be more sensitive to social, political and economic conditions in China and Hong Kong as compared to a Fund with a more geographically diverse investment portfolio. |
| Guinness Atkinson China & Hong Kong Fund | Risks of Investing in China and Hong Kong [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks of Investing in China and Hong Kong. The stock markets of China and Hong Kong may experience volatility and instability, which may cause a security to be worth more or less than it was at the time of purchase, and these risks can apply to particular sectors and particular securities and to entire markets. China and Hong Kong stocks could rise or fall with changes in economic or political circumstances in these countries, including in their global interactions, and these stocks may fall out of favor with investors, and the Renminbi-Yuan and the Hong Kong Dollar may decline in comparison to the U.S. dollar. China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. Hong Kong. Hong Kong companies could be adversely affected by changes in Hong Kong’s relationship with China, of which Hong Kong is a special administrative district. Recent changes in the political and legal structure in Hong Kong (but not the economic structure) could adversely affect companies in Hong Kong. Global reaction to China’s actions with respect to Hong Kong could also adversely affect the Fund’s investments in companies economically tied to Hong Kong. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to Hong Kong. |
| Guinness Atkinson China & Hong Kong Fund | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson China & Hong Kong Fund | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson China & Hong Kong Fund | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson China & Hong Kong Fund | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy , such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson China & Hong Kong Fund | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. |
| Guinness Atkinson China & Hong Kong Fund | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson China & Hong Kong Fund | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson China & Hong Kong Fund | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson China & Hong Kong Fund | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund’s strategy may not achieve its investment objective; portfolio manager judgments about securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson China & Hong Kong Fund | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap. Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson China & Hong Kong Fund | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with each Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold with seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson China & Hong Kong Fund | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Global Energy Fund | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of the Global Energy Fund and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Global Energy Fund | Energy Industry Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Energy Industry Risks. Prices of energy, including traditional sources of energy such as oil, gas, or electricity, and alternative energy, may fluctuate or decline due to many factors, including international political developments, real or perceived, demand for energy and sustainable energy, production and distribution policies of the OPEC (Organization of Petroleum Exporting Countries) and other oil-producing countries, energy conservation projects, changes in governmental regulations affecting companies in the energy business or related lines of business, including sustainable energy companies, , and changes in technology affecting businesses, changes in tax regulations relating to energy, and limitations or incentives affecting particular energy sources. A decline in energy prices would likely have a negative effect on securities held by the Fund. The Fund’s focus on the energy sector to the exclusion of other sectors exposes the Fund to greater market risk and potential monetary losses than if the Fund’s assets were diversified among various sectors. |
| Guinness Atkinson Global Energy Fund | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Global Energy Fund | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Global Energy Fund | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants is uncertain and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Global Energy Fund | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy , such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. Canada. The US is Canada’s largest trading partner of the US and Canada’s economy is closed linked to the US economy. Natural resources including energy and energy-related products and commodities are significant contributors to Canada’s economy. The Fund’s investments in Canadian companies could be adversely affected by volatility or declines in demand for energy and global demand for commodities produced by Canada. China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. |
| Guinness Atkinson Global Energy Fund | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as South Korea (Won), Taiwan (New Taiwan Dollar), Singapore (Singapore Dollar) and India (Rupee), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Global Energy Fund | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Global Energy Fund | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risks. The Fund may invest in companies in emerging markets including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Global Energy Fund | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Global Energy Fund | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund’s strategy may not achieve its investment objective; portfolio manager judgments about securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Global Energy Fund | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap. Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Global Energy Fund | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with each Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold with seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Global Energy Fund | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Global Innovators Fund | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of the Global Innovators Fund and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Global Innovators Fund | Industry Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Industry Risks. The technology, internet and communications industries or sectors are extremely competitive and subject to rapid rates of change. The competitive nature of these industries or sectors and rapid rate of change places a challenge on the management of these companies to be successful. The Fund may have more investments in these areas than other equity funds that do not focus on companies implementing innovation. |
| Guinness Atkinson Global Innovators Fund | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Global Innovators Fund | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Global Innovators Fund | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants is uncertain and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Global Innovators Fund | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. |
| Guinness Atkinson Global Innovators Fund | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as South Korea (Won), Taiwan (New Taiwan Dollar), Singapore (Singapore Dollar) and India (Rupee), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Global Innovators Fund | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Global Innovators Fund | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Global Innovators Fund | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Global Innovators Fund | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management Risk. The Fund’s strategy may not achieve its investment objective; portfolio manager judgments about securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Global Innovators Fund | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap. Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Global Innovators Fund | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with each Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold with seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Global Innovators Fund | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money by investing in shares of Guinness Atkinson Asia Pacific Dividend Builder ETF and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Dividend Paying Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Risks of Investing in Asia Pacific Securities [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks of Investing in Asia Pacific Securities. ☐ Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect the Fund’s investments. o Australia. Australia’s economy is more dependent than others on exports, especially in commodities, and key trading relationships with the US, China, Japan, Singapore, the UK and other European countries. Reduction in demand for commodities and services could adversely affect companies in Australia. o China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. o Hong Kong. Hong Kong companies could be adversely affected by changes in Hong Kong’s relationship with China, of which Hong Kong is a special administrative district. Recent changes in the political and legal structure in Hong Kong (but not the economic structure) could adversely affect companies in Hong Kong. Global reaction to China’s actions with respect to Hong Kong could also adversely affect the Fund’s investments in companies economically tied to Hong Kong. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to Hong Kong. o Singapore. Singapore’s economy relies heavily on exports and trade relationships with other countries. Singapore companies could be adversely affected by changes in its relationships with other countries in the Asia-Pacific region, as well as economic or political developments in other Asian nations that are key trading partners of Singapore. o Taiwan. Taiwan’s economy is more sensitive than others to changes in exports and global trading, and to tensions in Taiwan’s relationship with China. Tensions between Taiwan and China could materially adversely affect companies in Taiwan. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Risks Associated with Investments in Companies outside the United States [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Risks Associated with Investments in Companies outside the United States. ☐ Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal and regulatory risks, based on the size of their securities markets, competition for investments, interest rates, global or foreign trade activities (restrictions and tariffs or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU), as well as changes due to global or coordinated sanctions activities. Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non US securities may be more sensitive to changes in global economic activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The value of Fund shares could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. o China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. o Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as South Korea (Won), Taiwan (New Taiwan Dollar), Singapore (Singapore Dollar) and India (Rupee), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than U.S. markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries may generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and to holdings in depository receipts for foreign companies. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap (US$10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF shares and the value of the Fund’s underlying portfolio. This could lead to differences between the market price of the ETF Shares and the underlying value of the Fund shares. These differences can be magnified during times of significant market activity and could contribute to the ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to ETF Shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the underlying value of the Fund shares when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about each Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Absence of Active Trading Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Absence of Active Trading Market Risk. Although Fund Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson Asia Pacific Dividend Builder ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Fund may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson Dividend Builder ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money by investing in shares of Guinness Atkinson Dividend Builder ETF and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Dividend Builder ETF | Dividend Paying Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase. |
| Guinness Atkinson Dividend Builder ETF | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may become worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Dividend Builder ETF | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Dividend Builder ETF | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Global Risks. The Fund invests in companies in multiple countries within the Asia Pacific region, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. |
| Guinness Atkinson Dividend Builder ETF | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal and regulatory risks, based on the size of their securities markets, competition for investments, interest rates, global or foreign trade activities (restrictions and tariffs or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU), as well as changes due to global or coordinated sanctions activities. Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non US securities may be more sensitive to changes in global economic activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). o European Securities. The Fund may invest in companies in France, Germany, Netherlands, Switzerland, and the United Kingdom. Companies in countries in the European Union and the UK may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. |
| Guinness Atkinson Dividend Builder ETF | Securities of Companies in Asia [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and Taiwan. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. Countries in Asia may be more dependent on global trade relationships; interruptions in global trade could adversely affect securities of companies in Asia. ☐ Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect a Fund’s investments. o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Dividend Builder ETF | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The value of Fund shares could decline if the foreign currency of a market in which the Fund declines against the US Dollar. |
| Guinness Atkinson Dividend Builder ETF | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than U.S. markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Dividend Builder ETF | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally may have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and to holdings in depository receipts for foreign companies. The Fund’s investments in foreign issuers and depository receipts could make these holdings riskier than holdings in domestic companies. |
| Guinness Atkinson Dividend Builder ETF | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Dividend Builder ETF | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Dividend Builder ETF | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap (US$10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Dividend Builder ETF | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Liquidity Risk. The Funds invest in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Dividend Builder ETF | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Dividend Builder ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The market price of an ETF Share on the exchange may differ from the NAV. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF Shares and the value of the Fund’s underlying portfolio. This could lead to differences between market price of ETF Shares and the underlying value of the Fund shares. These differences can be magnified during times of significant market activity and could contribute to ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to the Fund’s shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about each Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson Dividend Builder ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences. |
| Guinness Atkinson Dividend Builder ETF | Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson Dividend Builder ETF | Absence of Active Trading Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Absence of Active Trading Market Risk. Although Fund Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund Shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of the ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of the ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson Dividend Builder ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Funds may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, ETF Shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson International Dividend Builder ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money by investing in shares of Guinness Atkinson International Dividend Builder ETF and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson International Dividend Builder ETF | Dividend Paying Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase. |
| Guinness Atkinson International Dividend Builder ETF | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson International Dividend Builder ETF | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced periods of extreme stress (sometimes relating to specific events) which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short-term volatility of the Fund. |
| Guinness Atkinson International Dividend Builder ETF | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Global Risks. The Fund invests primarily in companies economically tied to countries outside the U.S. Companies economically tied to countries outside the U.S., and U.S. companies that have exposure to non-U.S. companies, may face global risks. The Fund may invest in or be exposed to companies that are exposed to more global risks. Economies and financial markets globally are increasingly interconnected, which means that events or conditions in one locale can affect markets or companies in other countries or regions. Companies in which the Fund invests may experience differing outcomes with respect to inflation or deflation, interest rates, safety and security, economic uncertainties (including taxes, tariffs and import/export controls), natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events, sanctions or embargoes). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. • Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants or viruses is uncertain and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. • Capital Controls and Sanctions Risk. Beginning in 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions (direct and secondary) and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, and also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact companies in the Fund’s portfolio, which could adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson International Dividend Builder ETF | Investing in Non US Companies [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Investing in Non-US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal and regulatory risks, based on the size of their securities markets, competition for investments, interest rates, global or foreign trade activities (restrictions and tariffs or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU), as well as changes due to global or coordinated sanctions activities. Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non-US securities may be more sensitive to changes in global economic activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). o European Securities. The Fund may invest in companies in France, Germany, Netherlands, Switzerland, and the United Kingdom. Companies in countries in the European Union and the UK may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. ☐ Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and Taiwan. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. Countries in Asia may be more dependent on global trade relationships; interruptions in global trade could adversely affect securities of companies in Asia. ☐ Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect a Fund’s investments. o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson International Dividend Builder ETF | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The value of Fund shares could decline if the foreign currency of a market in which the Fund declines against the US Dollar. |
| Guinness Atkinson International Dividend Builder ETF | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than U.S. markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson International Dividend Builder ETF | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally may have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and to holdings in depository receipts for foreign companies. The Fund’s investments in foreign issuers and depository receipts could make these holdings riskier than holdings in domestic companies. |
| Guinness Atkinson International Dividend Builder ETF | Expropriation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson International Dividend Builder ETF | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson International Dividend Builder ETF | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US $1 billion), medium cap (under US $5 billion) and large cap (US $10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson International Dividend Builder ETF | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson International Dividend Builder ETF | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson International Dividend Builder ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The market price of an ETF Share on the exchange may differ from the NAV. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF Shares and the value of the Fund’s underlying portfolio. This could lead to differences between the market price of the Fund’s shares and the underlying value of the Fund shares (the NAV per share). These differences can be magnified during times of significant market activity and could contribute to the ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to the Fund’s shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about each Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson International Dividend Builder ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences. |
| Guinness Atkinson International Dividend Builder ETF | Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson International Dividend Builder ETF | Absence of Active Trading Market Risk [Member] | |
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| Risk [Text Block] | ☐ Absence of Active Trading Market Risk. Although Fund Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund Shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of the ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of the ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson International Dividend Builder ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Funds may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, ETF Shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson Real Assets Income ETF | Risk Lose Money [Member] | |
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| Risk [Text Block] | You can lose money by investing in shares of Real Assets Income ETF. |
| Guinness Atkinson Real Assets Income ETF | Real Estate-Related Securities Risk [Member] | |
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| Risk [Text Block] | • Real Estate-Related Securities Risk. The Fund will invest in real-estate related companies, including REITs (real estate investment trusts), as well as companies that own, hold, develop, manage or operate real estate assets. These companies expose investors indirectly to the risks associated with owning real estate directly, as well as the risks of operating real estate management companies. Real estate assets can be affected by changes in property values, government actions (including levels of tax or other local regulations), zoning designations, usage limitations, environmental conditions, limitations on rental income increases or evictions, casualty events (including natural disasters) and eminent domain. Real estate investments are sensitive to local, state and federal changes and can be cyclical, including during periods of overdevelopment. REITs may be subject to additional risks including risks relating to financing or leverage to acquire real-estate related assets, financial market and leverage exposures, and potential defaults. REITs may fail to continue to qualify for favorable tax or regulatory treatment, based on changes in underlying assets. |
| Guinness Atkinson Real Assets Income ETF | Infrastructure Risk [Member] | |
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| Risk [Text Block] | • Infrastructure Risk. Companies in the infrastructure industry may be subject to a variety of factors that could adversely affect their business or operations, including high or variable interest costs in connection with capital spending or construction programs (including government-backed programs), higher than average degrees of leverage, costs associated with governmental, environmental and other regulations, the level of government spending on or in support of infrastructure projects, and other factors. These companies may also be more sensitive to global or local changes in inflation, tariffs, supply chain constrictions, business disruptions, and changes in commodity or energy prices. Transportation costs associated with infrastructure projects may be affected by supply and demand for specific products or services, tax policy or tariffs, government regulation, world events and global or local economic conditions. Within Infrastructure, the Fund invests in companies exposed to the following types of risks: o Energy Sector Risk. The Fund invests in infrastructure companies that may be more sensitive to prices and developments in the energy sector, both long and short term. Prices of energy, whether traditional or sustainable, may fluctuate or decline due to many factors, including domestic or international political or economic developments (including tariffs or export or import restrictions), real or perceived, changes in supply or demand for demand for energy and sustainable energy, production and distribution policies of OPEC (Organization of Petroleum Exporting Countries) and other oil-producing countries, energy conservation projects, changes in governmental regulations affecting companies in the energy business or related lines of business, changes in technology affecting traditional or alternative energy, and changes in tax regulations relating to energy or goods relating to energy production, transportation, storage or distribution. Energy companies also face risks from terrorism, natural disasters and other catastrophic events, government interventions and energy conservation efforts. The performance of energy companies tends to be cyclical and highly dependent on energy prices, which can be subject to market interruptions and unforeseen financial pressures (such as when energy futures and energy prices misalign). A decline in energy prices would likely have a negative effect on securities held by the Fund. o Utility Industry Risk. The Fund will invest in companies that have more exposures to the utility sector than other funds. Companies in the utility sector may be sensitive to changes in interest rates, capital allocations, regulatory and tax changes. In most places, companies in the utilities industry are regulated by governmental entities, which can facilitate projects or alternatively increase costs and delays for projects. Utility companies may not be able to pass increased costs or expenses to customers without approval. In some areas, utility deregulation may cause increases in investment, competition, innovation and profits. In other places, costs associated with developing energy distribution resources may reduce competition, capital deployment and profits. All of these factors could affect dividend payments by utility companies. In addition, companies in the utilities industry may face cost increases and reduced access to fuel (such as oil, coal, natural gas, wind, solar or nuclear energy) and potentially high interest costs for borrowing to finance new projects. Even domestic U.S. utility companies can be affected by global developments affecting energy markets. o Communications Industry Risk. The Fund will invest in companies that are closely aligned to the communications sector, and these companies may be more vulnerable to product development cycles including obsolescence than other companies that are not as reliant upon digital and technological advancements and telephony. Companies in the communications industry can face rapid development and deployment of competitive innovations and products, some of which may be designed to “disrupt” established communication channels. These companies may also face competition, enhanced research and development costs (including satellite, platform access and cybersecurity costs), risks of government regulation, as well as data security and privacy concerns. These companies may also face increased risks of security breaches which may be aimed at enterprise data or customer/consumer data, the theft of which could expose a company to business losses as well as fines or other monetary consequences. These risks apply to the communications sector as a whole and to individual companies within this sector. The Fund could lose money if a company in its portfolio is adversely affected by one of these risks. o Natural Resources Risk. The Fund will invest in companies in the natural resources sector. These securities may decline for a range of reasons, including changes in interest rates, commodity prices, governmental regulator or support, taxes or tariffs, import or export restrictions, tariffs or threats of tariffs, environmental conditions, changes in exchange rates, catastrophic events, or changes in rates of depletion of resources. These securities may also change in value based on costs associated with the production, extraction, or transportation of these resources. |
| Guinness Atkinson Real Assets Income ETF | Concentration Risk [Member] | |
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| Risk [Text Block] | • Concentration Risk. The Fund will generally hold substantial assets in the Real Estate and Income companies, which means that it will be more sensitive to losses due to adverse events that affect these areas of the economy as a whole. The Fund’s concentration in these companies may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in these companies would have a larger impact on the Fund than on a fund that does not concentrate in such companies. At times, the performance of these companies may lag the performance of other industries or the broader market as a whole. |
| Guinness Atkinson Real Assets Income ETF | Dividend Paying Securities Risk [Member] | |
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| Risk [Text Block] | • Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase. |
| Guinness Atkinson Real Assets Income ETF | U.S. Securities Risk [Member] | |
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| Risk [Text Block] | • U.S. Securities Risk. The Fund invests in securities of issuers economically tied to the U.S. This means the Fund’s investments are subject to legal, regulatory, political, currency, security and economic risks that are specific to the U.S., including changes in the U.S. economy, interest rates, taxes or tariffs, or changes in U.S. financial markets including their integration into the global interconnected markets. |
| Guinness Atkinson Real Assets Income ETF | Equity Securities Risk [Member] | |
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| Risk [Text Block] | • Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Real Assets Income ETF | Market Risk [Member] | |
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| Risk [Text Block] | • Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced periods of extreme stress (sometimes relating to specific events) which resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short-term volatility of the Fund. |
| Guinness Atkinson Real Assets Income ETF | Global Risks [Member] | |
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| Risk [Text Block] | • Global Risks. The Fund invests primarily in companies economically tied to foreign countries and U.S. issuers that have exposure to non-U.S. companies. The Fund will invest in or be exposed to companies that are exposed to more global risks. Economies and financial markets globally are increasingly interconnected, which means that events or conditions in one locale can affect markets or companies in other countries or regions. Companies in which the Fund invests may experience differing outcomes with respect to inflation or deflation, interest rates, safety and security, economic uncertainties (including taxes, tariffs and import/export controls), natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events, sanctions or embargoes). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Capital Controls and Sanctions Risk. Beginning in 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions (direct and secondary) and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, and also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact companies in the Fund’s portfolio, which could adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Real Assets Income ETF | Investing in Non US Companies [Member] | |
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| Risk [Text Block] | • Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal, and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs, or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU). Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). o European Securities. The Fund may invest in companies in France, Germany, Netherlands, Switzerland, and the United Kingdom. Companies in countries in the European Union and the UK may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. o Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and Taiwan. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. Countries in Asia may be more dependent on global trade relationships; interruptions in global trade could adversely affect securities of companies in Asia. ☐ Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect a Fund’s investments. o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Real Assets Income ETF | Currency and Currency Exchange Risks [Member] | |
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| Risk [Text Block] | • Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. |
| Guinness Atkinson Real Assets Income ETF | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than US markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Real Assets Income ETF | Emerging Markets Risks [Member] | |
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| Risk [Text Block] | • Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Real Assets Income ETF | Expropriation Risk [Member] | |
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| Risk [Text Block] | • Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Real Assets Income ETF | Management Risk [Member] | |
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| Risk [Text Block] | • Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Real Assets Income ETF | Capitalization Risk [Member] | |
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| Risk [Text Block] | • Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US $1 billion), medium cap (under US $5 billion) and large cap (US $10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Real Assets Income ETF | Liquidity Risk [Member] | |
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| Risk [Text Block] | • Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Real Assets Income ETF | Fund Cybersecurity Risk [Member] | |
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| Risk [Text Block] | • Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Real Assets Income ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF shares and the value of the Fund’s underlying portfolio. This could lead to differences between the market price of the ETF Shares and the underlying value of the Fund shares. These differences can be magnified during times of significant market activity and could contribute to the ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to ETF Shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the underlying value of the Fund shares when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about the Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson Real Assets Income ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences. |
| Guinness Atkinson Real Assets Income ETF | Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson Real Assets Income ETF | Absence of Active Trading Market Risk [Member] | |
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| Risk [Text Block] | • Absence of Active Trading Market Risk. Although ETF Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson Real Assets Income ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Fund may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson Smart Transportation & Technology ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money investing in shares of Guinness Atkinson Smart Transportation & Technology ETF, and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Smart Transportation & Technology ETF | Autonomous/Electric Vehicle Risk [Member] | |
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| Risk [Text Block] | • Autonomous/Electric Vehicle Risk. Autonomous and/or electric vehicles are a relatively new development in transportation markets. They could fail to “catch on” with consumers in a meaningful way and could suffer technical problems, supply or demand shortfalls, or be supplanted by other technologies. Vehicles, applications, hardware, software or services could become obsolete before they are fully embraced or deployed, or may use technologies, systems and software that are unproven, defective, malfunctioning, and are subject to cybersecurity threats; any of these factors could cause them to become obsolete more rapidly than traditional technologies and software. Autonomous and/or electric vehicles may rely on fuel sources that are more sensitive to commodities market activity than traditional vehicle fuels and could be adversely affected by underlying commodity market activity. Some autonomous and/or electric vehicle projects may rely on government subsidies that could be reduced or eliminated. These risks could adversely affect the value of companies in which the Fund invests. |
| Guinness Atkinson Smart Transportation & Technology ETF | Technology Risk [Member] | |
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| Risk [Text Block] | • Technology Risk. The technologies used by autonomous and electric vehicles and their support systems, such as software, grids, networks, fuel and batteries, may be unproven, susceptible to obsolescence or subject to future regulation in countries or locations of deployment. Technologies may also lack scalability, are subject to competition and rapid changes in technology standards or development, and may be incompatible with future developments. Technologies also involve intellectual property components that are regulated or protected differently in various countries, and which are subject to risk of theft, misappropriation or vandalism. These technologies may also be at increased risk of failure or attack because they are designed to interact with other non-proprietary technologies and applications across one or more external networks. Companies producing technology or software upon which autonomous and/or electric vehicles or networks rely may decide to discontinue support for the technology or software or restrict its deployment into major markets. Software or technology involved in autonomous and/or electric vehicles, networks, grids, infrastructure or services related to autonomous and/or electric vehicles could be adversely affected by network events or outages (local or global). These risks may cause the securities of companies making these products to be worth less than at the time of purchase. This risk applies to the sector as a whole and to individual securities within the sector. |
| Guinness Atkinson Smart Transportation & Technology ETF | Cybersecurity Risk [Member] | |
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| Risk [Text Block] | • Cybersecurity Risk. Technologies created or deployed for Smart Transportation, including for vehicles or drive systems as well as for networks and intelligent roadways, may be subject to greater cybersecurity risk than other companies. Technology programs and networks may be subject to an increased risk of attack or infiltration and may be more susceptible to “network” attacks or outages and to theft or alteration of data. Some programs may be designed to interact with data about or from customers or products, and data and/or its transmission could become regulated in multiple jurisdictions. A cybersecurity event in a technology or program used by a Smart Transportation network or product could be exacerbated, and companies could be subject to claims for loss or injury in multiple jurisdictions. |
| Guinness Atkinson Smart Transportation & Technology ETF | Product Risk [Member] | |
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| Risk [Text Block] | • Product Risk. Companies creating products and technologies for autonomous or electric transportation, for passenger, commercial or freight usage, face considerable competition. There is no guarantee that companies that successfully create a product will obtain product adoption, or that a product will not become obsolete quickly. Companies in this area may have research and development expenses that are significantly higher than companies in other parts of the transportation sector, which could make their securities less desirable. |
| Guinness Atkinson Smart Transportation & Technology ETF | Product Regulation Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Product Regulation Risk. Autonomous vehicles and their networks may be subject to multiple levels of regulation including local regulations and operating restrictions. They could be or become subject to a variety of domestic or foreign regulatory regimes governing “artificial intelligence”, which have not yet been fully developed or adopted. Regulatory changes governing privacy, data collection or storage, transfer or automation could also adversely affect smart transportation products or systems. Limitations on applications for autonomous or electric vehicles could adversely affect the value of companies in which the Fund invests. |
| Guinness Atkinson Smart Transportation & Technology ETF | Equity Securities Risk [Member] | |
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| Risk [Text Block] | • Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Smart Transportation & Technology ETF | Market Risk [Member] | |
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| Risk [Text Block] | • Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Smart Transportation & Technology ETF | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Global Risks. The Fund invests in companies in multiple countries, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. o Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Smart Transportation & Technology ETF | Investing in Non US Companies [Member] | |
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| Risk [Text Block] | • Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal and regulatory and other risks, based on the size of their securities markets, competition for investments, interest rates, and global or foreign trade activities (restrictions and tariffs or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU), as well as changes due to global or coordinated sanctions activities., as well as changes due to global or coordinated sanctions activities. Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non US securities may be more sensitive to changes in global economy activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). |
| Guinness Atkinson Smart Transportation & Technology ETF | European Securities [Member] | |
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| Risk [Text Block] | ☐ European Securities. The Fund may invest in companies in France, Germany, Netherlands, Switzerland, and the United Kingdom. Companies in countries in the European Union and the UK may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. o Germany. German companies are subject to risks specific to Germany, and companies in Germany may be adversely impacted by events occurring in other parts of the EU, including withdrawal or financial events. Germany’s economy is closely tied to key trading partner relationships with counties inside and outside the EU. Reductions in global consumption of German goods or services, changes in key trading partner economies, or changes in domestic regulation of labor, manufacturing or energy in Germany, could negatively affect Germany’s economy, which could have a negative effect on the Fund’s investments. o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Smart Transportation & Technology ETF | Securities of Companies in Asia [Member] | |
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| Risk [Text Block] | • Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and Taiwan. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. Countries in Asia may be more dependent on global trade relationships; interruptions in global trade could adversely affect securities of companies in Asia. o Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect the Fund’s investments. o China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Additional Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. o South Korea Risks. South Korea’s economy is sensitive to changes in international trade, and could be adversely affected if there is a downturn in export markets globally. Substantial political tensions exist between North Korea and South Korea. South Korea’s economy and South Korean companies could be adversely affected by increases in tension between North Korea and South Korea. |
| Guinness Atkinson Smart Transportation & Technology ETF | Legal, Accounting, Audit and Disclosure may vary [Member] | |
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| Risk [Text Block] | Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. |
| Guinness Atkinson Smart Transportation & Technology ETF | Currency and Currency Exchange Risks [Member] | |
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| Risk [Text Block] | • Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The Fund’s NAV could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. o China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. o Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. For other countries, such as Australia (Australia Dollar), currency volatility is relatively low over longer terms. Some currencies, such as the South Korean Won, trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Smart Transportation & Technology ETF | Foreign Securities Market Risks [Member] | |
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| Risk [Text Block] | • Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than U.S. markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Smart Transportation & Technology ETF | Emerging Markets Risks [Member] | |
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| Risk [Text Block] | • Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and holdings in depository receipts for foreign companies. |
| Guinness Atkinson Smart Transportation & Technology ETF | Expropriation Risk [Member] | |
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| Risk [Text Block] | • Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Smart Transportation & Technology ETF | Management Risk [Member] | |
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| Risk [Text Block] | • Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Smart Transportation & Technology ETF | Capitalization Risk [Member] | |
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| Risk [Text Block] | • Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US $1 billion), medium cap (under US $5 billion) and large cap (US $10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small-cap and medium-cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Smart Transportation & Technology ETF | Liquidity Risk [Member] | |
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| Risk [Text Block] | • Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Smart Transportation & Technology ETF | Fund Cybersecurity Risk [Member] | |
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| Risk [Text Block] | • Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Smart Transportation & Technology ETF | Shares May Trade At Prices Other Than NAV [Member] | |
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| Risk [Text Block] | • Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of an ETF Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF shares and the value of the Fund’s underlying portfolio. This could lead to differences between the market price of the ETF Shares and the underlying value of the Fund shares. These differences can be magnified during times of significant market activity and could contribute to the ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to ETF Shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the underlying value of the Fund shares when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about each Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson Smart Transportation & Technology ETF | Cash Redemption Risk [Member] | |
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| Risk [Text Block] | • Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains, and cause the Fund to incur brokerage expenses and could result in tax consequences. |
| Guinness Atkinson Smart Transportation & Technology ETF | Redemption Risk [Member] | |
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| Risk [Text Block] | • Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson Smart Transportation & Technology ETF | Absence of Active Trading Market Risk [Member] | |
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| Risk [Text Block] | • Absence of Active Trading Market Risk. Although ETF Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the Fund arbitrage process (that is, arbitrage will be less effective at keeping the market price of ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson Smart Transportation & Technology ETF | Authorized Participant Risk [Member] | |
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| Risk [Text Block] | • Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Fund may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson Sustainable Energy ETF | Risk Lose Money [Member] | |
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| Risk [Text Block] | You can lose money by investing in shares of Guinness Atkinson Sustainable Energy ETF, and investing in shares of this Fund may be more risky than investing in a fund that only invests in U.S. securities due to increased volatility of foreign markets. |
| Guinness Atkinson Sustainable Energy ETF | Industry Risks [Member] | |
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| Risk [Text Block] | • Industry Risks. Prices of energy, whether traditional or sustainable, may fluctuate or decline due to many factors, including international political or economic developments, real or perceived, demand for energy and sustainable energy, production and distribution policies of OPEC (Organization of Petroleum Exporting Countries) and other oil-producing countries, energy conservation projects, changes in governmental regulations affecting companies in the energy business or related lines of business, including Sustainable Energy companies, changes in technology affecting Sustainable Energy, and changes in tax regulations relating to energy. Energy prices are also affected by limitations or incentives affecting particular energy sources. A decline in energy prices would likely have a negative effect on securities held by the Fund. The Fund’s focus on sustainable energy businesses exposes the Fund to greater market risk and potential monetary losses than if the Fund’s assets were diversified among various industries or sectors. |
| Guinness Atkinson Sustainable Energy ETF | Equity Securities Risk [Member] | |
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| Risk [Text Block] | • Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson Sustainable Energy ETF | Market Risk [Member] | |
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| Risk [Text Block] | • Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced a period of extreme stress which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short term volatility of the Fund. |
| Guinness Atkinson Sustainable Energy ETF | Global Risks [Member] | |
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| Risk [Text Block] | • Global Risks. The Fund invests in companies in multiple countries, and companies in which the Fund invests may experience differing outcomes with respect to safety and security, economic uncertainties, natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic, which is ongoing. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. Covid-19 may continue in the foreseeable future and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. o Capital Controls and Sanctions Risk. In 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, but also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact a Fund’s ability to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson Sustainable Energy ETF | Investing in Non US Companies [Member] | |
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| Risk [Text Block] | ☐ Investing in Non US Companies. Investing in companies outside the U.S., including in countries in Europe and Asia, involves different and additional political, social, economic, legal and regulatory risks, based on the size of their securities markets, competition for investments, interest rates, global or foreign trade activities (restrictions and tariffs or threats of changes to restrictions or tariffs), and changes in the global economy, such as “Brexit”, the withdrawal of the United Kingdom from the European Union (EU), as well as changes due to global or coordinated sanctions activities. Impacts of Brexit are likely to be higher on companies with significant contacts with the United Kingdom, including companies in Europe. Non-US companies, whether in developed or emerging markets, may be more sensitive to these factors, which can increase volatility, reduce liquidity and negatively affect economic growth. The Fund’s ability to access foreign securities markets can be limited, which can affect availability, liquidity and pricing of foreign securities. o Sensitivity to global events. Non US securities may be more sensitive to changes in global economic activity, including interest rates as well as trading activity, including trade restrictions, tariffs, or threats of changes to restrictions or tariffs. These companies may be more sensitive to global economic transitions and stresses, such as Brexit, central bank or government interventions (commonly involving interest rates but also stimulus and sanctions). Investing in non-US securities can also expose the Fund to risks associated with the potential imposition of economic or other sanctions against a particular country, or businesses or industries, including trade restrictions or tariffs (or threats thereof). o European Securities. The Fund may invest in companies in Europe and the United Kingdom. Companies in countries in the European Union and the UK may be more sensitive to changes as a result of Brexit, the withdrawal of the United Kingdom from the European Union. These changes could include changes in how goods, technology or services are delivered or received between the European Union countries and the United Kingdom. o Legal, Accounting, Audit and Disclosure may vary. Foreign countries have different legal, accounting, auditing and financial disclosure systems, which may make information about companies more difficult to understand, and less information may be available. Under foreign legal systems, different standards may apply for foreign governments to take over assets, restrict the ability to exchange currency or restrict the delivery of securities. Some foreign companies may be subject to special restrictions in U.S. markets due to non-compliance with U.S. audit inspection standards. o Securities of Companies in Asia. The Fund may invest in securities of companies in Asia, including China and South Korea. Investments in securities of Chinese companies can be impacted by currency and exchange rate fluctuations, in addition to price volatility, illiquidity and changes in China’s regulatory, monetary and socioeconomic policies, and limitations on access to Chinese issuers. ☐ Asia Pacific stock markets may experience volatility and instability, and these risks can apply to entire economies, particular sectors and particular securities. Asia Pacific stocks could rise or fall with changes in economic or political circumstances in specific countries, may fall out of favor with investors, and currencies of countries in the Asia Pacific region may decline in comparison to the U.S. dollar. Stocks economically tied to the Asia Pacific region may be more sensitive to economic, political, social or legal changes in countries in the Asia Pacific region, which could adversely affect the Fund’s investments. ☐ China. China’s government exercises significant control over its capital markets and currency markets, including its securities markets. China is also an emerging market. The Fund’s investments may be affected by currency and exchange rate fluctuations, price volatility, illiquidity and trading restrictions, which can differ between China’s stock exchanges and stock exchanges that list securities of companies economically tied to China. Changes in the regulatory, monetary or socioeconomic policies in China, and limitations on access to China issuers (including limitations on access through variable interest entities (VIEs)), could adversely affect the Fund’s investments in China. Foreign investors, such as the Fund, may face different risks than domestic investors when investing in companies in China, especially with respect to lack of transparency, fraud, volatility, corporate incentives, macro-economic shocks, national security and changes in US-China policy. China’s policies can also impact securities of companies economically tied to Hong Kong and Taiwan. See “Risks of Investing in our Funds” for specific risks of investing in companies economically tied to China. ☐ South Korea Risks. South Korea’s economy is sensitive to changes in international trade, and could be adversely affected if there is a downturn in export markets globally. Substantial political tensions exist between North Korea and South Korea. South Korea’s economy and South Korean companies could be adversely affected by increases in tension between North Korea and South Korea. |
| Guinness Atkinson Sustainable Energy ETF | Currency and Currency Exchange Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Currency and Currency Exchange Risks. The Fund’s currency is US Dollars, while some of its investments are denominated in foreign currencies. Foreign currencies may fluctuate against the US Dollar and some foreign currencies are more volatile, especially during times of economic stress, and foreign countries may limit trading or repatriation of currencies. The Fund’s NAV could be affected by a change in foreign currency exchange rates. The Fund may incur costs associated with exchanging dollars into foreign currencies, and vice versa, for investing in foreign securities. The value of Fund shares could decline if the foreign currency of a market in which the Fund invests declines against the US Dollar. o China Currency Risk. The Fund’s investments in Chinese issuers are subject to risks associated with China’s currency, which is subject to economic objectives of China’s government including devaluation. China has only comparatively recently moved from a pegged currency to a managed float. China’s currency, the Renminbi Yuan, is not completely freely tradable and may not at all times reflect economic fundamentals of China’s economy. The value of the Renminbi Yuan is subject to changes based on the economic objectives of the Chinese government, including devaluation in order to improve the competitiveness of Chinese goods in an effort to improve the Chinese balance of trade. o Other Currency Risk. Currencies of some countries in the Asia Pacific region are subject to greater volatility as compared to the US dollar. Currency volatility is relative and can be periodic. For some countries, their currency may not reflect entirely the fundamental components of a country’s economy. Some currencies, such as South Korea (Won), trade only in local markets and may be more volatile than other currencies. The Fund could pay more if it had to acquire a foreign currency when the amplitude of its volatility is high as measured against the US Dollar. |
| Guinness Atkinson Sustainable Energy ETF | Foreign Securities Market Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Foreign Securities Market Risks. Foreign securities markets generally have lower trading volumes than U.S. markets, which means it may be more difficult for the Fund to buy or sell foreign securities. Additionally, trading on foreign securities markets may involve longer settlement periods and higher transaction costs. Some foreign securities markets are closed to trading for extended periods (foreseeable and unplanned), which could make the Fund’s holdings in those markets illiquid or hard to value. Government oversight of foreign stock exchanges and brokerage industries may be less stringent than in the United States. Some foreign securities markets restrict access by non-domestic investors. The Fund’s investments in securities traded on foreign markets could make this Fund more risky than a fund that only invests in securities traded on US exchanges. |
| Guinness Atkinson Sustainable Energy ETF | Emerging Markets Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Emerging Markets Risks. The Fund may invest in companies in emerging markets, including China. Emerging market countries may generally have less established economies, smaller capital markets and greater social, economic, regulatory or political risks. These factors could contribute to increased volatility, liquidity risks and valuation risks. These risks apply to direct holdings in foreign companies and to holdings in depository receipts for foreign companies. |
| Guinness Atkinson Sustainable Energy ETF | Expropriation Risk [Member] | |
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| Risk [Text Block] | ☐ Expropriation Risk. Investments in foreign countries are subject to expropriation risk, and the risk that foreign governments act to limit investment in foreign securities, through exchange controls, currency restrictions and taxation. There can be limits on the Fund’s ability to pursue and collect a legal judgment against a foreign government if an expropriation event occurs. |
| Guinness Atkinson Sustainable Energy ETF | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson Sustainable Energy ETF | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US$1 billion), medium cap (under US$5 billion) and large cap (US$10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small-cap and medium-cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson Sustainable Energy ETF | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Liquidity Risk. The Fund invests in securities, which may become illiquid, and there is liquidity risk associated with the Fund’s own shares. Securities in which the Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. The Fund may be more sensitive to this risk because it invests in non-US securities. Some of the foreign markets in which the Fund invests may be closed for national holidays or other reasons, which may cause some holdings to be illiquid. Illiquidity in portfolio securities could cause the Fund’s shares to trade at a premium or discount. The Fund has adopted a liquidity risk management program to manage liquidity risk of its underlying portfolio. |
| Guinness Atkinson Sustainable Energy ETF | Fund Cybersecurity Risk [Member] | |
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| Risk [Text Block] | ☐ Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson Sustainable Energy ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | • Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Market Price could vary from NAV due to foreign holdings. The Fund will hold shares of non-U.S. securities traded in local markets that close at a different time than the NYSE Arca. During the time when the NYSE Arca is open but after the applicable local market has closed, the price of a foreign security that is held by the Fund and included in the Fund’s NAV will be the most recent closing price in that security’s local market, updated for currency changes, until that local market opens again. In that case, the prices used in calculating the Fund’s NAV may be based on closing prices of securities traded in non-U.S. markets that have not been updated, except for currency changes. When all or a portion of the Fund’s portfolio consists of securities traded in a market that is closed when the market for the Fund’s shares is open, there could be differences between the value of ETF shares and the value of the Fund’s underlying portfolio. This could lead to differences between the market price of the ETF Shares and the underlying value of the Fund shares. These differences can be magnified during times of significant market activity and could contribute to the ETF Shares trading at a premium or discount. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to ETF Shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the underlying value of the Fund shares when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. |
| Guinness Atkinson Sustainable Energy ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. For some portfolio holdings traded in specific foreign markets that do not permit in-kind transfers, the Fund will need to sell securities and deliver cash to redeeming Authorized Participants. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses and could result in tax consequences. |
| Guinness Atkinson Sustainable Energy ETF | Redemption Risk [Member] | |
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| Risk [Text Block] | ☐ Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson Sustainable Energy ETF | Absence of Active Trading Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Absence of Active Trading Market Risk. Although ETF Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of the ETF Shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF Shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson Sustainable Energy ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Fund may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, shares may trade at a premium or discount to the Fund’s net asset value. This risk could be heightened because the Fund will invest in non-U.S. securities, which may be traded outside a collateralized settlement system. In such a case, Authorized Participants may be required to post collateral for some trades on an agency basis (that is, on behalf of other market participants), which only a limited number of Authorized Participants may be willing to do. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |
| Guinness Atkinson US Dividend Builder ETF | Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You can lose money by investing in shares of Guinness Atkinson US Dividend Builder ETF. |
| Guinness Atkinson US Dividend Builder ETF | Dividend Paying Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Dividend Paying Securities Risk. The Fund invests in securities that pay dividends. There is no guarantee that the securities held by the Fund will declare or pay dividends in the future, or that dividends will remain at current levels or increase. |
| Guinness Atkinson US Dividend Builder ETF | U.S. Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ U.S. Securities Risk. The Fund invests in securities of issuers economically tied to the U.S. This means the Fund’s investments are subject to legal, regulatory, political, currency, security and economic risks that are specific to the U.S., including changes in the U.S. economy, interest rates, taxes or tariffs, or changes in U.S. financial markets including their integration into the global interconnected markets. |
| Guinness Atkinson US Dividend Builder ETF | Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Equity Securities Risk. The Fund invests in publicly-traded equity securities, and their value may fluctuate, sometimes rapidly and unpredictably, which means a security may be worth more or less than when it was purchased. These fluctuations can be based on a variety of factors including a company’s financial condition as well as macro-economic factors such as interest rates, inflation rates, global market conditions, and non-economic factors such as market perceptions and social or political events. |
| Guinness Atkinson US Dividend Builder ETF | Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Market Risk. General market conditions can affect the value of the Fund’s securities holdings. Market risk applies to individual securities, a particular sector or the entire economy. Recently, global financial markets have experienced periods of extreme stress (sometimes related to specific events) which resulted in unusual and extreme volatility in the equity markets and in the prices of individual securities. In some cases, the prices of securities issued by individual companies have been negatively impacted even though there may be little or no apparent degradation in the financial conditions or prospects of that company. Although the Fund invests in U.S. securities, global events, financial market shocks or interest rate events could cause equity securities generally to decline in value, including if fixed income securities become more favorable. These market conditions add significantly to the risk of short-term volatility of the Fund. |
| Guinness Atkinson US Dividend Builder ETF | Global Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Global Risks. The Fund invests primarily in companies in the U.S. or economically tied to the U.S. Companies economically tied to countries outside the U.S. and U.S. companies that have exposure to non-U.S. companies, may face global risks. The Fund may invest in or be exposed to companies that are exposed to more global risks. Economies and financial markets globally are increasingly interconnected, which means that events or conditions in one locale can affect markets or companies in other countries or regions. Companies in which the Fund invests may experience differing outcomes with respect to inflation or deflation, interest rates, safety and security, economic uncertainties (including taxes, tariffs and import/export controls), natural and environmental conditions, health conditions (including pandemics such as Covid-19) and/or systemic market dislocations (including market dislocations due to events outside a company’s country or region, including supply chain events, sanctions or embargoes). The global interconnectivity of industries and companies, especially with respect to goods, can be negatively impacted by events occurring beyond a company’s principal geographic location. These events can contribute to volatility, valuation and liquidity issues, and can affect specific companies, countries, regions and global markets. o Pandemic Risk. In 2020, markets globally were impacted by the Covid-19 pandemic. This pandemic adversely affected industries, including supply chains, as well as general financial conditions, and has resulted in restrictions on commercial activity (shutdowns), interruptions in labor and supply markets, economic stimulus packages and other governmental interventions, and reallocation of market resources. Total economic effects of Covid-19 cannot be predicted. The continued impact of Covid-19 and related variants or viruses is uncertain and could adversely affect companies in the Fund’s portfolio, including by affecting their operating capabilities or their willingness or ability to pay dividends, which could negatively impact stock prices as well as yield. o Capital Controls and Sanctions Risk. Beginning in 2022, a number of countries imposed capital controls and economic and other sanctions in response to Russia’s invasion of Ukraine. The range of sanctions (direct and secondary) and their impact continues to evolve but has included asset seizures, restrictions on the transfer or exchange of currency, restrictions on asset transfers, exclusions from international banking systems, export limitations and limitations on listing shares of companies that are economically tied to Russia and Belarus, including depositary receipts on shares of affected companies. Sanctions programs have been imposed by individual countries, and also on a coordinated basis. The duration of sanctions programs and capital controls in response to the invasion of Ukraine cannot be predicted with any certainty. Capital controls and/or sanctions could adversely impact companies in the Fund’s portfolio, which could adversely affect the trading market and price for Fund shares, and otherwise cause the Fund to decline in value. |
| Guinness Atkinson US Dividend Builder ETF | Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Management Risk. The Fund’s strategy may not achieve its investment objective; the portfolio managers’ qualitative judgments about portfolio companies or their securities may be incorrect or the Adviser might not properly implement the strategy. |
| Guinness Atkinson US Dividend Builder ETF | Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Capitalization Risk. The Fund invests in companies with a range of capitalizations, including small cap (under US $1 billion), medium cap (under US $5 billion) and large cap (US $10 billion or more). Small cap and medium cap companies may be more susceptible to financial downturns, have limited product lines, may be illiquid or experience volatility and may have limited financial resources. Large cap companies may have frequent price changes based on general economic conditions and may be adversely affected by declines among lines of business, and may be less agile in responding to market and product challenges. Investing in small cap and medium cap companies may make the Fund more risky than a fund that only invests in securities of larger capitalization companies. |
| Guinness Atkinson US Dividend Builder ETF | Liquidity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Liquidity Risk. The Funds invest in securities, which may become illiquid, and there is liquidity risk associated with a Fund’s own shares. Securities in which a Fund invests could become illiquid, which means that the securities cannot be sold within seven days under current market conditions without significantly affecting the price at which the investment is carried on the Fund’s books. Investments that become illiquid may be more difficult to value. Illiquidity in portfolio securities could cause a Fund’s shares to trade at a premium or discount. The Funds have adopted a liquidity risk management program to manage liquidity risk of each Fund’s underlying portfolio. |
| Guinness Atkinson US Dividend Builder ETF | Fund Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Fund Cybersecurity Risk. Cybersecurity risk applies to the Fund, its service providers and the companies in which the Fund invests. Cybersecurity risk includes breaches, intentional or unintended, that may impact a company’s ability to operate, and could include data corruption, theft or loss, improper access to proprietary information, or interference with technology operations. Companies could suffer losses due to cybersecurity events, including fines, penalties, reputational injuries, as well as financial losses and legal and compliance expenses. Cybersecurity risks of the Fund include risks applicable to the Fund’s service providers. While the Fund and its service providers have established cybersecurity defenses, there is no guarantee that these defenses will be effective. |
| Guinness Atkinson US Dividend Builder ETF | Shares May Trade At Prices Other Than NAV [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Shares May Trade At Prices Other Than NAV. “ETF Shares” are the Fund’s individual exchange-traded shares, which are listed for trading on the NYSE Arca. Shares are bought and sold in the secondary market at a market price. The Fund’s NAV is calculated once per day, at the end of the day. The market price of a Share on the exchange could be higher than the NAV (premium), or lower than the NAV (discount). o Market Price could vary from NAV. The market price of an ETF Share on the exchange can change throughout the day and may differ from the Fund’s NAV per share, which is calculated only once per day, at the end of the day. o Costs of buying, selling or holding Fund Shares. Purchases and sales of ETF Shares on the exchange through a broker may incur a brokerage charge or commission, frequently a fixed amount; this may be a significant proportional cost for investors transacting in small numbers of shares. The difference between the price investors are willing to pay for ETF Shares (the “bid” price) and the price at which investors are willing to sell ETF Shares (the “ask” price) is called the “spread.” The spread with respect to ETF shares varies over time based on the Fund’s trading volume and market liquidity, and is generally lower (or “narrower”) if the Fund has a lot of trading volume and market liquidity and higher (or “wider”) if the Fund has little trading volume and market liquidity. When the spread widens, or when premiums or discounts become larger than usual, particularly in times of market stress, investors may pay significantly more or receive significantly less than the Fund’s NAV when they buy or sell ETF Shares in the secondary market. Because of the costs of buying and selling shares of the Fund, frequent trading may reduce investment returns. You could lose money if you sell your shares at a point when the market price is below the Fund’s NAV. o Information about the Fund’s spread. The Fund’s website will contain information about each Fund’s per share NAV, closing market price, premiums and discounts, and the median bid/ask spread. If a Fund’s premium or discount exceeds 2% for more than 7 consecutive trading days, the website will also disclose the factors that the investment adviser reasonably believes materially contribute to this trading premium or discount. |
| Guinness Atkinson US Dividend Builder ETF | Cash Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Cash Redemption Risk. The Fund may be required to sell portfolio securities if it is required to pay cash in redemption of Creation Units to Authorized Participants. Generally, the Fund will effectuate redemptions in kind. There is a risk that the Fund could lose money if it had to sell its securities in times of overall market turmoil or when the Fund’s portfolio securities have declined in value, or if the securities become illiquid. Selling securities could generate capital gains and cause the Fund to incur brokerage expenses, and could result in tax consequences. |
| Guinness Atkinson US Dividend Builder ETF | Redemption Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Redemption Risk. ETF Shares are not individually redeemable. The Fund only redeems ETF Shares in Creation Units, which are large blocks of shares, from Authorized Participants. If you want to liquidate some or all of your investment in shares of the Fund, you would have to sell them on the secondary market at prevailing market prices, which may be lower than NAV. |
| Guinness Atkinson US Dividend Builder ETF | Absence of Active Trading Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Absence of Active Trading Market Risk. Although Fund Shares will be listed on the NYSE Arca exchange, there is no guarantee that an active trading market for Fund Shares will exist at all times. In times of market stress, markets can suffer erratic or unpredictable trading activity, extraordinary volatility or wide bid/ask spreads, which could cause some market makers and Authorized Participants to reduce their market activity or “step away” from making a market in ETF Shares, and market makers and Authorized Participants are not obligated to place or execute purchase and redemption orders. This could cause the Fund’s market price to deviate, materially, from the NAV, and reduce the effectiveness of the ETF arbitrage process (that is, arbitrage will be less effective at keeping the market price of the ETF Shares aligned closely with the value of its underlying portfolio). Trading in ETF Shares on the NYSE Arca exchange may be halted if individual or market-wide “circuit breakers” are activated (circuit breakers halt trading for a specific period of time when the price of a particular security or overall market prices decline by a pre-determined percentage). Trading of ETF shares also could be halted if (1) the shares are delisted from the NYSE Arca exchange without first being listed on another exchange or (2) NYSE Arca exchange officials determine that halting is appropriate in the interest of a fair and orderly market or to protect investors. Any absence of an active trading market for ETF shares could lead to a heightened risk that there will be a difference between the market price of an ETF Share and the underlying value of the ETF Share. |
| Guinness Atkinson US Dividend Builder ETF | Authorized Participant Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ☐ Authorized Participant Risk. Only a limited number of financial institutions that enter into an authorized participant agreement with the Funds may engage in creation or redemption transactions. If the Fund’s Authorized Participants decide not to create or redeem shares, ETF Shares may trade at a premium or discount to the Fund’s net asset value. This risk could also be heightened because the Fund uses a focused investment strategy. If Authorized Participants do not proceed with creation and redemption orders for shares, the Fund’s share price could trade at a discount to NAV and could face trading halts or de-listing. |