Investment Risks - Astoria Real Assets ETF |
Mar. 31, 2025 |
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| Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | The Fund’s shares will change in value and you could lose money by investing in the Fund. |
| Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | An investment in the Fund is not a bank deposit and it is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, the Advisor, or any of their affiliates. |
| Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic, political, or geopolitical conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as tariffs, labor shortages or increased production costs and competitive conditions within an industry. In addition, local, regional or global events such as war, acts of terrorism, international conflicts, trade disputes, supply chain disruptions, cybersecurity events, the spread of infectious illness or other public health issues, natural disasters or climate events, or other events could have a significant impact on a security or instrument. The increasing interconnectivity between global economies and financial markets increases the likelihood that events or conditions in one region or financial market may adversely impact issuers in a different country, region or financial market. |
| Equity Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Equity Securities Risk. The value of the equity securities held by the Fund or Underlying ETFs may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund or the Underlying ETFs participate, or factors relating to specific companies in which the Fund or Underlying ETFs invest. |
| Debt Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Debt Securities Risk. Investments in debt securities subject the holder to the credit risk of the issuer. Credit risk refers to the possibility that the issuer or other obligor of a security will not be able or willing to make payments of interest and principal when due. Generally, the value of debt securities will change inversely with changes in interest rates. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. During periods of falling interest rates, the income received by the Fund may decline. If the principal on a debt security is prepaid before expected, the prepayments of principal may have to be reinvested in obligations paying interest at lower rates. Debt securities generally do not trade on a securities exchange making them generally less liquid and more difficult to value than common stock. |
| U.S. Treasury Obligations and TIPS Risk [Member] | |
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| Risk [Text Block] | U.S. Treasury Obligations and TIPS Risk. U.S. Treasury obligations, including TIPS, may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. TIPS are income-generating instruments whose interest and principal are adjusted for inflation. The inflation adjustment, which is typically applied monthly to the principal of the bond, follows a designated inflation index, the Consumer Price Index (CPI), and TIPS’ principal payments are adjusted according to changes in the CPI. While this may provide a hedge against inflation, the returns may be relatively lower than those of other securities. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund’s exposure to U.S. Treasury obligations to decline. |
| Foreign Securities Risk [Member] | |
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| Risk [Text Block] | Foreign Securities Risk. Investments in the securities of non-U.S. issuers involve risks beyond those associated with investments in U.S. securities. These additional risks include greater market volatility, the availability of less reliable financial information, higher transactional and custody costs, taxation by foreign governments, decreased market liquidity and political instability. Some countries and regions have experienced security concerns, war or threats of war and aggression, terrorism, economic uncertainty, natural and environmental disasters and/or systemic market dislocations that have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on the U.S. and world economies and markets generally. Foreign issuers are often subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping than are U.S. issuers, and therefore not all material information will be available. Securities exchanges or foreign governments may adopt rules or regulations that may negatively impact the Fund’s ability to invest in foreign securities or may prevent the Fund from repatriating its investments. Less developed securities markets are more likely to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories. The less developed a country’s securities market is, the greater the likelihood of custody problems. |
| Real Assets Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Real Assets Risk. The Fund’s investments in securities linked to real assets, such as precious metals, commodities, land, equipment and natural resources, involve significant risks, including financial, operating, and competitive risks. Investments in securities linked to real assets may expose the Fund to adverse macroeconomic conditions, such as changes and volatility in commodity prices, a rise in interest rates or a downturn in the economy in which the asset is located. Changes in inflation rates or in the market’s inflation expectations may adversely affect the market value of equities linked to real assets. |
| Underlying ETF Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Underlying ETF Risk. The Fund’s investment in shares of Underlying ETFs subjects it to the risks of owning the holdings underlying the Underlying ETF, as well as the same structural risks faced by an investor purchasing shares of the Fund, including authorized participant concentration risk, market maker risk, premium/discount risk and trading issues risk. As a shareholder in another ETF, the Fund bears its proportionate share of the Underlying ETF’s expenses, subjecting Fund shareholders to duplicative expenses. |
| Geographic Investment Risk [Member] | |
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| Risk [Text Block] | Geographic Investment Risk. The Fund may invest a substantial amount of its assets in securities of issuers located in a single country or geographic region. As a result, any changes to the regulatory, political, social or economic conditions in such country or geographic region will generally have greater impact on the Fund than such changes would have on a more geographically diversified fund and may result in increased volatility and greater losses. This risk may be especially pronounced to the extent the Fund invests in countries and regions experiencing, or likely to experience, security concerns, war, threats of war, terrorism, economic uncertainty and natural disasters. The Fund may have significant risks with respect to the following geographic regions: • Asia Risk. Investments in securities of issuers in certain Asian countries involve risks that are specific to Asia, including certain legal, regulatory, political and economic risks. Certain Asian countries have experienced expropriation and/or nationalization of assets, confiscatory taxation, political instability, piracy of intellectual property data, armed conflict, and social instability as a result of religious, ethnic, socio-economic and/or political unrest. In particular, escalated tensions involving North Korea and any outbreak of hostilities involving North Korea, or even the threat of an outbreak of hostilities, could have a severe adverse effect on Asian economies. Some economies in this region are dependent on a range of commodities, strongly affected by international commodity prices, and particularly vulnerable to price changes for these products. The market for securities in this region may also be directly influenced by the flow of international capital and by the economic and market conditions of neighboring countries. Some Asian economies are highly dependent on trade and the economic conditions in other countries within and outside of Asia can impact these economies. • Canada Risk. The Fund is subject to certain risks specifically associated with investments in the securities of Canadian issuers. The Canadian economy is heavily dependent on the demand for natural resources and agricultural products. Canada is a major producer of commodities such as forest products, metals, agricultural products, and energy related products like oil, gas, and hydroelectricity. Accordingly, a change in the supply and demand of these resources, both domestically and internationally, can have a significant effect on Canadian market performance. Canada is a top producer of zinc and uranium and a global source of many other natural resources, such as gold, nickel, aluminum, and lead. Conditions that weaken demand for such products worldwide could have a negative impact on the Canadian economy as a whole. Changes to the U.S. economy may significantly affect the Canadian economy because the U.S. is Canada’s largest trading partner and foreign investor. These and other factors could have a negative impact on the Fund and its investments in Canada. • Europe Risk. Most developed countries in Western Europe are members of the European Union (“EU”), and many are also members of the European Monetary Union (“EMU”), which requires compliance with restrictions on inflation rates, deficits and debt levels. Unemployment in certain European nations is historically high and several countries face significant debt problems. These conditions can significantly affect every country in Europe. The euro is the official currency of the EU and, accordingly, the Fund’s investment in European securities may lead to significant exposure to the euro and events affecting it. Recent market events affecting several EU member countries have adversely affected the sovereign debt issued by those countries, and ultimately may lead to a decline in the value of the euro. A significant decline in the value of the euro, or the exit of a country from the EU or EMU, may produce unpredictable effects on trade and commerce generally and could lead to increased volatility in financial markets worldwide. Political or economic disruptions in European countries, even in countries in which the Fund is not invested, may adversely affect security values and thus the Fund’s holdings. In particular, Russia’s large-scale invasion of Ukraine and the economic and diplomatic responses by the United States, EU, United Kingdom and other countries, including heavy sanctions on the Russian economy, have led to increased volatility and uncertainty in European and global financial markets and could negatively impact regional and global economies for the foreseeable future. Also, the Fund’s investments in the United Kingdom and other European countries may be significantly impacted by the decision of the United Kingdom to leave the EU (known as “Brexit”). Brexit has introduced significant uncertainty and may have a negative impact on the economy and currency of the United Kingdom and European countries, including increased market volatility and illiquidity and potentially lower economic growth. |
| Currency Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Currency Risk. The values of investments in securities denominated in foreign currencies increase or decrease as the rates of exchange between those currencies and the U.S. dollar change. Currency conversion costs and currency fluctuations could erase investment gains or add to investment losses. Currency exchange rates can be volatile and are affected by factors such as general economic conditions, the actions of the United States and foreign governments or central banks, the imposition of currency controls, and speculation. |
| MLP Risk [Member] | |
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| Risk [Text Block] | MLP Risk. Investment in securities of an MLP involves risks that differ from investments in common stock, including risks related to limited control and limited rights to vote on matters affecting the MLP, risks related to potential conflicts of interest between the MLP and the MLP’s general partner, cash flow risks, dilution risks and risks related to the general partner’s right to require unit-holders to sell their common units at an undesirable time or price. Certain MLP securities may trade in low volumes due to their small capitalizations. Accordingly, those MLPs may be subject to more abrupt or erratic price movements and may lack sufficient market liquidity to enable the Fund to effect sales at an advantageous time or without a substantial drop in price. MLPs are generally considered interest-rate sensitive investments. During periods of interest rate volatility, these investments may not provide attractive returns. MLPs may incur environmental costs and liabilities due to the nature of their businesses and the substances they handle. Changes in existing laws, regulations or enforcement policies governing the energy sector could significantly increase the compliance costs of MLPs. The Fund will select its investments in MLPs from the current small pool of issuers. Demand for investment opportunities in MLPs that operate energy-related businesses may exceed supply, which could make it difficult to operate the Fund. |
| MLP Tax Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | MLP Tax Risk. A change in current tax law, or a change in the business of an MLP, could result in an MLP being treated as a corporation or other form of taxable entity for U.S. federal income tax purposes, which could result in the MLP being required to pay U.S. federal income tax, excise tax or another form of tax on its taxable income. The classification of an MLP as a corporation or other form of taxable entity for U.S. federal income tax purposes could reduce the amount of cash available for distribution by the MLP and could cause any such distributions received by the Fund to be treated as dividend income, return of capital, or capital gain. Therefore, if any MLPs owned by the Fund were treated as corporations or other forms of taxable entities for U.S. federal income tax purposes, the after-tax return to the Fund with respect to its investment in such MLPs could be materially reduced, which could cause a material decrease in the net asset value per share (“NAV”) of the Fund’s shares. |
| Commodities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Commodities Risk. The Fund has exposure to commodities through investments in Underlying ETFs. Commodity prices can have significant volatility, and exposure to commodities can cause the value of the Fund’s shares to decline or fluctuate in a rapid and unpredictable manner. The values of commodities may be affected by changes in overall market movements, real or perceived inflationary trends, commodity index volatility, changes in interest rates or currency exchange rates, population growth and changing demographics, international economic, political and regulatory developments, and factors affecting a particular region, industry or commodity, such as drought, floods, or other weather conditions, livestock disease, changes in storage costs, trade embargoes, competition from substitute products, transportation bottlenecks or shortages, fluctuations in supply and demand, and tariffs. A liquid secondary market may not exist for certain commodity investments, which may make it difficult for the Fund to sell them at a desirable price or at the price at which it is carrying them. The commodity markets are subject to temporary distortions or other disruptions due to, among other factors, lack of liquidity, the participation of speculators, and government regulation and other actions. |
| Commodity-Linked Derivatives Risk [Member] | |
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| Risk [Text Block] | Commodity-Linked Derivatives Risk. The value of a commodity-linked derivative instrument in which an Underlying ETF may invest typically is based upon the price movements of the underlying commodity or an economic variable linked to such price movements. The prices of commodity-related investments may fluctuate quickly and dramatically as a result of changes affecting a particular commodity and may not correlate to price movements in other asset classes, such as stocks, bonds and cash. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade, or the applicable clearing house may default or otherwise fail to perform. In addition, each exchange or trading facility on which the derivatives are traded has the right to suspend or limit trading in all futures or other instruments that it lists. An Underlying ETF’s use of commodity-linked derivatives may also have a leveraging effect on the Underlying ETF’s portfolio. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the Fund would otherwise have had. An Underlying ETF is required to post margin in respect to its holdings in derivatives. Each of these factors and events could have a significant negative impact on the Fund. |
| Derivatives Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Derivatives Risk. Derivatives include instruments and contracts that are based on and valued in relation to one or more underlying securities, financial benchmarks, indices, or other reference obligations or measures of value. Major types of derivatives include futures, options, swaps and forward contracts. Using derivatives exposes the Fund to additional or heightened risks, including leverage risk, liquidity risk, valuation risk, market risk, counterparty risk, and credit risk. Derivatives transactions can be highly illiquid and difficult to unwind or value, they can increase Fund volatility, and changes in the value of a derivative held by the Fund may not correlate with the value of the underlying instrument or the Fund’s other investments. Many of the risks applicable to trading the instruments underlying derivatives are also applicable to derivatives trading. However, derivatives are subject to additional risks such as operational risk, including settlement issues, and legal risk, including that underlying documentation is incomplete or ambiguous. For derivatives that are required to be cleared by a regulated clearinghouse, other risks may arise from the Fund’s relationship with a brokerage firm through which it submits derivatives trades for clearing, including in some cases from other clearing customers of the brokerage firm. • Futures Contracts Risk. The Fund expects that certain of the Underlying ETFs in which it invests will utilize futures contracts for its commodities investments. Futures contracts are typically exchange-traded contracts that call for the future delivery of an asset by one party to another at a certain price and date, or cash settlement of the terms of the contract. The risk of a position in a futures contract may be very large compared to the relatively low level of margin the Underlying ETF is required to deposit. In many cases, a relatively small price movement in a futures contract may result in immediate and substantial loss or gain to the investor relative to the size of a required margin deposit. In the event no secondary market exists for a particular contract, it might not be possible to effect closing transactions, and the Underlying ETF will be unable to terminate the derivative. If the Underlying ETF uses futures contracts for hedging purposes, there is a risk of imperfect correlation between movements in the prices of the derivatives and movements in the securities or index underlying the derivatives or movements in the prices of the Underlying ETF’s investments that are the subject of such hedge. The prices of futures contracts may not correlate perfectly with movements in the securities or index underlying them. • Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund’s performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk. |
| Crypto Asset Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Crypto Asset Risk. Crypto assets, such as bitcoin and ether, are digital assets that are designed to act as a medium of exchange. Despite being referred to as “currencies,” crypto assets are not widely accepted as a medium of exchange, and there is no guarantee that they will ever be accepted as such. The value of the Fund’s investments in crypto assets, through Crypto Asset ETFs and options linked to Crypto Asset ETFs, is subject to fluctuations in the value of the underlying crypto assets. The value of a crypto asset is determined by the supply of and demand for the crypto asset in the global market, which consists of transactions on electronic exchanges. Pricing on exchanges and other venues can be volatile and can adversely affect the value of the Fund’s exposure to the crypto asset. Currently, there is relatively limited use of crypto assets in the retail and commercial marketplace in comparison to the relatively large use of crypto assets by speculators, thus contributing to price volatility that could adversely affect the Fund’s investments. Crypto asset transactions are irrevocable, and stolen or incorrectly transferred crypto assets may be irretrievable. As a result, any incorrectly executed transactions could adversely affect the value of the Fund’s investments in Crypto Asset ETFs and options linked to Crypto Asset ETFs. Crypto assets generally operate without central authority (such as a bank) and are not backed by any government; therefore crypto assets are not subject to the same degree of regulation as are registered U.S. securities. The reporting, accounting and auditing standards for crypto assets may differ from the standards for registered U.S. securities. Due to the unregulated nature and lack of transparency surrounding the operations of crypto asset platforms, which may experience fraud, manipulation, security failures or operational problems, as well as the wider crypto asset market, the value of a crypto asset and, consequently, the value of the Fund’s investments in Crypto Asset ETFs and options linked to Crypto Asset ETFs may be adversely affected. The Fund will indirectly bear its proportionate share of management fees and other expenses that are charged by Crypto Asset ETFs in addition to its own direct expenses and will pay brokerage commissions in connection with the purchase and sale of shares of Crypto Asset ETFs. Like other ETFs, the shares of Crypto Asset ETFs may be bought and sold in the secondary market and may trade at a premium or discount to their net asset value. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity in the secondary market, in which case such premiums or discounts may be significant and the bid-ask spread could widen. Although the shares are listed for trading on an exchange, it cannot be assumed that an active trading market for the shares will be maintained. The lack of an active trading market for the shares may result in limited market liquidity and losses when selling the shares. In addition, Crypto Asset ETFs have a limited number of financial institutions that may act as authorized participants (“APs”) and there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent that (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform such functions, shares may trade at a material discount to NAV, the bid-ask spread could widen, and shares could face trading halts and/or delisting. Spot Crypto Asset ETPs are not registered investment companies under the 1940 Act or commodity pools under the Commodity Exchange Act (“CEA”), and therefore investors in Spot Crypto Asset ETPs do not have the regulatory protections associated with ownership of shares in an investment company registered under the 1940 Act or the protections afforded by the CEA. Moreover, as sponsors of Spot Crypto Asset ETPs have a limited track record in operating investment vehicles that specifically deal with crypto assets, their experience may be inadequate or unsuitable to manage them. |
| Crypto Asset Tax Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Crypto Asset Tax Risk. Many significant aspects of the U.S. federal income tax treatment of investments in crypto assets are uncertain and an investment in crypto assets, even indirectly, may produce income that is not treated as qualifying income for purposes of the income test applicable to regulated investment companies, such as the Fund. Certain of the investment vehicles with exposure to crypto assets held by the Fund may be treated as grantor trusts for U.S. federal income tax purposes, which would result in such investments generally being treated as a direct investments in crypto assets for such purposes. Those investment vehicles might not produce “qualifying income” for purposes of the Fund’s qualification as a regulated investment company. The Fund generally will not be able to receive more than 10% of its gross income from such investments. |
| Crypto Asset and Blockchain Companies Risk [Member] | |
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| Risk [Text Block] | Crypto Asset and Blockchain Companies Risk. Companies involved in the crypto asset or blockchain industries are subject to the risks associated with blockchain technology. Blockchain technology is new and many of its uses may be untested. There is no assurance that widespread adoption of blockchain technology will occur, and the development and acceptance of competing platforms or technologies may cause consumers or investors to use an alternative to blockchain technology, which may adversely impact companies in the crypto asset blockchain industries. Transacting on a blockchain depends in part specifically on the use of cryptographic keys that are required to access a user’s account (or “wallet”). Cybersecurity incidents may specifically target a user’s transaction history, digital assets, or identity, thereby leading to privacy concerns. The theft, loss, or destruction of these keys could adversely affect a user’s ownership claims over an asset or a company’s business or operations if it was dependent on the blockchain. In addition, certain features of blockchain technology, such as decentralization, open source protocol, and reliance on peer-to-peer connectivity, may increase the risk of fraud or cyber-attack by potentially reducing the likelihood of a coordinated response. A significant disruption of internet connectivity affecting large numbers of users or geographic areas could impede the functionality of blockchain technologies. Blockchain platforms are largely unregulated, and the regulatory environment is rapidly evolving. As a result, companies engaged in such blockchain activities may be exposed to adverse regulatory action, fraudulent activity, or even failure. There can be no guarantee that future regulation of blockchain technology will not have a negative impact on the value of such technologies and of the companies in the which the Fund invests. |
| Portfolio Turnover Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Portfolio Turnover Risk. Active and frequent trading of the Fund’s portfolio securities may lead to higher transaction costs and may result in a greater number of taxable transactions than would otherwise be the case, which could negatively affect the Fund’s performance. A high rate of portfolio turnover is 100% or more. |
| Sector Focus Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sector Focus Risk. The Fund may invest a larger portion of its assets in one or more sectors than many other funds, and thus will be more susceptible to negative events affecting those sectors. • Energy Sector Risk. Companies in the energy sector may be adversely affected by, among other things, supply and demand both for their specific product or service and for energy products in general, changes in prices of energy, exploration and production spending, government regulation, world events, exchange rates, economic conditions and energy conservation efforts. Revenues for energy companies may come significantly from a relatively limited number of customers, including governmental entities and utilities. As a result, governmental budget constraints may have a significant impact on energy companies. Energy companies also face a significant threat from accidents resulting in injury, pollution or other environmental concerns and natural disasters. • Financials Sector Risk. Companies in the financials sector, such as retail and commercial banks, insurance companies and financial services companies, are especially subject to the adverse effects of economic recession, currency exchange rates, extensive government regulation, decreases in the availability of capital, volatile interest rates, portfolio concentrations in geographic markets, industries or products (such as commercial and residential real estate loans) and competition from new entrants and blurred distinctions in their fields of business. • Industrials Sector Risk. Performance of companies in the industrials sector may be affected by, among other things, supply and demand for their specific product or service and for industrials sector products in general. Moreover, government regulation, world events, exchange rates and economic conditions, technological developments, fuel prices, labor agreements, insurance costs, and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies. • Materials Sector Risk. Performance of companies in the materials sector can be significantly impacted by the level and volatility of commodity prices, the exchange value of the dollar, import and export controls, increased competition, liability for environmental damage, depletion of resources, and mandated expenditures for safety and pollution controls. • Real Estate Sector Risk. The real estate sector may be subject to the possibility of declines in the value of real estate, losses from casualty or condemnation, and changes in local and general economic conditions, supply and demand, interest rates, environmental liability, zoning laws, regulatory limitations on rents, property taxes, and operating expenses. • Utilities Sector Risk. Companies in the utilities sector are subject to a variety of factors that may adversely affect their business or operations, including high interest costs associated with capital construction and improvement programs; difficulty in raising adequate capital in periods of high inflation and unsettled capital markets; governmental regulation of rates the issuer can charge to customers; costs associated with compliance with environmental and other regulations; effects of economic slowdowns and surplus capacity; increased competition; and potential losses resulting from a developing deregulatory environment. |
| Securities Exchange Companies Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Securities Exchange Companies Risk. The Fund’s investments in the securities in the financials sector may include securities issued by a securities exchange. The business and financial performance of a securities exchange can be impacted by a number of factors, including general economic conditions, market volatility, changes in investment patterns and priorities, preferences for services offered by competing exchanges and other service providers, technology developments and regulatory constraints. A substantial portion of a securities exchange’s revenues are derived from data services fees and fees for transactions executed and cleared in its markets. Data subscriptions and trading volumes could decline substantially if market participants reduce their level of spending or trading activities. A reduction in overall trading volume could also render a securities exchange less attractive to market participants as a source of liquidity, which could result in further loss of trading volume and associated transaction-based revenues and in the demand for data and other services. Further, a decline in the initial public offering market, or issuers choosing to list on alternative venues, could have an adverse effect on the revenues of a securities exchange. A securities exchange may not be successful in offering new products or technologies or in identifying opportunities, which could reduce long-term customer demand for services provided by a securities exchange. |
| Depositary Receipts Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Depositary Receipts Risk. The Fund may invest in depositary receipts. Depositary receipts may be subject to certain of the risks associated with direct investments in the securities of foreign companies, such as currency, political, economic and market risks, because their values depend on the performance of the non-dollar denominated underlying foreign securities. Certain countries may limit the ability to convert depositary into the underlying foreign securities and vice versa, which may cause the securities of the foreign company to trade at a discount or premium to the market price of the related depositary receipts. Depositary receipts may be purchased through “sponsored” or “unsponsored” facilities. A sponsored facility is established jointly by a depositary and the issuer of the underlying security. A depositary may establish an unsponsored facility without participation by the issuer of the deposited security. Unsponsored receipts may involve higher expenses and may be less liquid. Holders of unsponsored depositary receipts generally bear all the costs of such facilities, and the depositary of an unsponsored facility frequently is under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through voting rights to the holders of such receipts in respect of the deposited securities. |
| Market Capitalization Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Market Capitalization Risk. The securities of small-capitalization and mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions. Larger, more established companies may be unable to attain the high growth rates of successful, smaller companies during periods to economic expansion. |
| Issuer Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Issuer Risk. Issuer-specific attributes may cause a security held by the Fund to be more volatile than the market generally. The prices of, and income generated by, securities held by the Fund may decline in response to various factors directly related to the issuers of such securities, including reduced demand for an issuer’s goods or services, poor management performance, major litigation, investigations or other controversies related to the issuer, changes in the issuer’s financial condition or credit rating, changes in government regulation affecting the issuer or its competitive environment, and strategic initiatives such as mergers, acquisitions or dispositions and the market response to any such initiatives. An individual security may also be affected by factors related to the industry or sector of the issuer or the securities markets as a whole, and conversely an industry or sector or the securities markets may be affected by a change in financial condition or another event affecting a single issuer. The value of an individual security or particular type of security may be more volatile than the market as a whole and may perform differently from the value of the market as a whole. At times, the Fund may invest more significantly in a single issuer, which could increase the Fund’s volatility and the risk of loss arising from the factors described above. |
| Royalty Trusts Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Royalty Trusts Risk. The Fund may invest in publicly-traded royalty trusts. Royalty trusts are special purpose vehicles organized as investment trusts created to make investments in operating companies or their cash flows. A royalty trust generally acquires an interest in natural resource companies and distributes the income it receives to the investors of the royalty trust. A sustained decline in demand for the royalty trust’s underlying commodity could adversely affect income and royalty trust revenues and cash flows. Factors that could lead to a decrease in market demand include a recession or other adverse economic conditions, rising interest rates, an increase in the market price of the underlying commodity, higher taxes or other regulatory actions that increase costs, or a shift in consumer demand for the products. |
| ETF Structure Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Structure Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks: • Authorized Participant Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that act as authorized participants on an agency basis (i.e., on behalf of other market participants). To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other authorized participant is able to step forward to process creation or redemption orders, shares may trade at a discount to the Fund’s NAV and possibly face delisting. • Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used. • Costs of Buying or Selling Shares: Investors buying or selling shares in the secondary market will pay brokerage commissions or other charges imposed by brokers, as determined by that broker. Brokerage commissions are often a fixed amount and may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of shares. In addition, secondary market investors will also incur the cost of the difference between the price at which an investor is willing to buy shares (the “bid” price) and the price at which an investor is willing to sell shares (the “ask” price). This difference in bid and ask prices is often referred to as the “spread” or “bid-ask spread.” The bid-ask spread varies over time for shares based on trading volume and market liquidity, and the spread is generally lower if shares have more trading volume and market liquidity and higher if shares have little trading volume and market liquidity. Further, a relatively small investor base in the Fund, asset swings in the Fund, and/or increased market volatility may cause increased bid-ask spreads. Due to the costs of buying or selling shares, including bid-ask spreads, frequent trading of shares may significantly reduce investment results and an investment in shares may not be advisable for investors who anticipate regularly making small investments. • Fluctuation of NAV Risk: As with all ETFs, shares may be bought and sold in the secondary market at market price. Although it is expected that the market price of shares will approximate the Fund’s NAV, there may be times when the market price of shares is more than the NAV intra-day (premium) or less than the NAV intra- day (discount). Differences in market price and NAV may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related to, but not identical to, the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. These differences can be especially pronounced during times of market volatility or stress. During these periods, the demand for Fund shares may decrease considerably and cause the market price of Fund shares to deviate significantly from the Fund’s NAV. • Market Maker Risk. If the Fund has lower average daily trading volumes, it may rely on a small number of third-party market makers to provide a market for the purchase and sale of Fund shares. Any trading halt or other problem relating to the trading activity of these market makers could result in a dramatic change in the spread between the Fund’s NAV and the price at which the Fund shares are trading on the Exchange, which could result in a decrease in value of the Fund shares. In addition, decisions by market makers or authorized participants to reduce their role or step away from these activities in times of market stress could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying values of the Fund’s portfolio securities and the Fund’s market price. This reduced effectiveness could result in Fund shares trading at a discount to NAV and also in greater than normal intra-day bid-ask spreads for Fund shares. • Shares are Not Individually Redeemable. Shares are only redeemable by the Fund at NAV if they are tendered in Creation Units. Only authorized participants may engage in such creation and redemption transactions directly with the Fund. Individual shares may be sold on a stock exchange at their current market prices, which may be less, more, or equal to their NAV. • Trading Issues Risk. Although the Fund shares are listed for trading on the Exchange, there can be no assurance that an active trading market for such Fund shares will develop or be maintained. Trading in Fund shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Fund shares inadvisable. In addition, trading in Fund shares on the Exchange is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange “circuit breaker” rules. Market makers are under no obligation to make a market in the Fund shares, and authorized participants are not obligated to submit purchase or redemption orders for Creation Units. There can be no assurance that the requirements of the Exchange necessary to maintain the listing of the Fund will continue to be met or will remain unchanged. Initially, due to the small asset size of the Fund, it may have difficulty maintaining its listings on the Exchange. |
| Operational Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Operational Risk. The Fund is exposed to operational risks arising from a number of factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third parties, failed or inadequate processes and technology or systems failures. The Fund and the Advisor seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address these risks. |
| Management and Strategy Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Management and Strategy Risk. The value of your investment depends on the judgment of the Advisor and sub- advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect. |
| Tax Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Tax Risk. In order to qualify for the favorable tax treatment generally available to regulated investment companies, the Fund must satisfy certain diversification and other requirements. In particular, the Fund generally may not acquire a security if, as a result of the acquisition, more than 50% of the value of the Fund’s assets would be invested in (a) issuers in which the Fund has, in each case, invested more than 5% of the Fund’s assets and (b) issuers more than 10% of whose outstanding voting securities are owned by the Fund. If the Fund were to fail to qualify as a regulated investment company, it would be taxed in the same manner as an ordinary corporation, and distributions to its shareholders would not be deductible by the Fund in computing its taxable income. |
| Recent Market Events [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Recent Market Events. Periods of market volatility may occur in response to market events, public health emergencies, natural disasters or climate events, and other economic, political, and global macro factors. U.S. and international markets have recently experienced, and may continue to experience, periods of significant volatility due to various factors, including uncertainty regarding inflation and central banks’ interest rate changes, the possibility of a national or global recession, trade tensions and tariffs, and political and geopolitical events. In addition, wars or threats of war and aggression, such as Russia’s invasion of Ukraine and the conflicts among nations and militant groups in the Middle East, have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on the U.S. and world economies and markets generally, each of which may negatively impact the Fund’s investments. Additionally, since the change in the U.S. presidential administration in 2025, the administration has pursued an aggressive foreign policy agenda, including actual or potential imposition of tariffs, which may have consequences on the United States’ relations with foreign countries, the economy, and markets generally. These and other similar events could be prolonged and could adversely affect the value and liquidity of the Fund’s investments, impair the Fund’s ability to satisfy redemption requests, and negatively impact the Fund’s performance. |
| Cybersecurity Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Advisor, Astoria, and/or other service providers (including custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality. In an extreme case, a shareholder’s ability to exchange or redeem Fund shares may be affected. The use of artificial intelligence and machine learning could exacerbate these risks. Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value of those securities could decline if the issuers experience cybersecurity incidents. |