USD Emerging Markets Sovereign Bond ETF Investment Risks - USD Emerging Markets Sovereign Bond ETF |
Feb. 28, 2026 |
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| General Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | General Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Underlying Index or in the Fund’s portfolio may underperform in comparison to securities in general financial markets, a particular financial market or other asset classes due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, trade wars, retaliatory trade measures, sanctions and other trade barriers, supply chain disruptions, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics or the threat or potential of one or more such factors and occurrences. |
| Foreign Securities and Emerging Markets Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Foreign Securities and Emerging Markets Risk. Investments in foreign issuers and foreign securities (including depositary receipts) are subject to additional risks, including political and economic risks, unstable governments, civil conflicts and war, greater volatility, decreased market liquidity, expropriation and nationalization risks, sanctions or other measures by the United States or other governments, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets. In certain markets where securities and other instruments are not traded “delivery versus payment,” the Fund may not receive timely payment for securities or other instruments it has delivered or receive delivery of securities paid for and may be subject to increased risk that the counterparty will fail to make payments or delivery when due or default completely. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund’s ability to buy and sell securities.Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable becoming riskier and more volatile. These risks are magnified in countries in “emerging markets.” Emerging market countries typically have less-established market economies than developed countries and may face greater social, economic, regulatory and political uncertainties. In addition, emerging markets typically present greater illiquidity and price volatility concerns due to smaller or limited local capital markets and greater difficulty in determining market valuations of securities due to limited public information on issuers. The Underlying Index (and therefore the Fund) does not directly weight securities on the basis of investor protection considerations and/or the availability and quality of information regarding issuers. Certain emerging market countries may be subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping and therefore, material information related to an investment may not be available or reliable. Additionally, the Fund may have substantial difficulties exercising its legal rights or enforcing a counterparty’s legal obligations in certain jurisdictions outside of the United States, in particular in emerging market countries, which can increase the risks of loss. From time to time, certain companies in which the Fund invests may operate in, or have dealings with, countries subject to sanctions or embargoes imposed by the U.S. government and the United Nations and/or in countries the U.S. government identified as state sponsors of terrorism. One or more of these companies may be subject to constraints under U.S. law or regulations that could negatively affect the company's performance. Additionally, one or more of these companies could suffer damage to its reputation if the market identifies it as a company that invests or deals with countries that the U.S. government identifies as state sponsors of terrorism or subjects to sanctions. |
| Asia Pacific Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Asia Pacific Market Risk. The economies in the Asia Pacific region are in all stages of economic development and may be intertwined. The small size of securities markets and the low trading volume in some countries in the Asia Pacific region may lead to a lack of liquidity, and natural disasters common to the region, including floods, droughts, earthquakes, fires and tsunamis, may adversely affect the economies and markets in the region. The share prices of companies in the region tend to be volatile and there is a significant possibility of loss. Many of the countries in the region are developing, both politically and economically, and as a result companies in the region may be subject to risks like nationalization or other forms of government interference, and/or may be heavily reliant on only a few industries or commodities, and may be subject to national or regional security concerns, including terrorism, war, strained international relations, or the threat or potential of one or more such events. Investments in the region may also be subject to currency risks, such as restrictions on the flow of money in and out of the country, extreme volatility relative to the U.S. dollar, and devaluation, all of which could decrease the value of the Fund. |
| Greater China Region Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Greater China Region Risk. In addition to the risks listed under “Foreign Securities and Emerging Markets Risk,” investments in Mainland China and Hong Kong are subject to significant legal, regulatory, monetary and economic risks, as well as the potential for regional and global conflicts, including actions that are contrary to the interests of the U.S. Investments in Mainland China involve political and legal uncertainties, currency fluctuations and aggressive currency controls, the risk of confiscatory taxation, and nationalization or expropriation of assets, which could adversely affect and significantly diminish the values of the Mainland Chinese companies in which the Fund invests. The Mainland Chinese securities markets are emerging markets characterized by greater price volatility. Mainland China is dominated by the one-party rule of the Communist Party, and the Mainland Chinese government exercises significant control over Mainland China’s economic growth. China’s economy is highly reliant on trade and may be adversely affected by a deterioration in global demand, supply chain issues, or labor shortages. There is also the potential of increased tariffs and restrictions on trade between the United States and Mainland China. An increase in tariffs or trade restrictions, or even the threat of such developments, could lead to a significant reduction in international trade, which could have a negative impact on Mainland Chinese companies and a commensurately negative impact on the Fund. The political reunification of Mainland China and Taiwan, over which Mainland China continues to claim sovereignty, is a highly complex issue. There is the potential for future political, military or economic disturbances that may have an adverse impact on the values of the Fund’s investments in Mainland China and elsewhere, or make certain Fund investments impractical or impossible. Any escalation of hostility between Mainland China and Taiwan would likely have a significant adverse impact on the value and liquidity of the Fund’s investments in both Mainland China and elsewhere, causing substantial investment losses for the Fund. Hong Kong is a Special Administrative Region of the People’s Republic of China. Since Hong Kong reverted to Chinese sovereignty in 1997, it has been governed by the Basic Law. Under the Basic Law, Hong Kong was guaranteed a high degree of autonomy in certain matters, including economic matters, until 2047. Attempts by the government of Mainland China to exert greater control over Hong Kong’s economic, political or legal structures or its existing social policy, could negatively affect investor confidence in Hong Kong (as has been the case previously during certain periods), which in turn could negatively affect markets and business performance. Chinese operating companies sometimes rely on variable interest entity (VIE) structures to raise capital from non-Chinese investors, even though such arrangements are not formally recognized under Chinese law. In a VIE structure, a Mainland China-based operating company establishes an entity (typically offshore) that enters into service and other contracts (such as powers of attorney, equal pledge agreements and other services or business cooperation agreements) with the Mainland Chinese company designed to provide economic exposure to the company. The offshore entity then issues exchange-traded shares that are sold to the public, including non-Chinese investors (such as the Fund). Shares of the offshore entity are not equity ownership interests in the Mainland Chinese operating company and therefore the ability of the offshore entity to control the activities at the Mainland Chinese company are limited and the Mainland Chinese company may engage in activities that negatively impact investment value. Under a VIE structure, the Fund will typically have little or no ability to influence the Mainland China-based operating company through proxy voting or other means because it is not a Mainland Chinese company owner/shareholder. The VIE structure is designed to provide the offshore entity (and in turn, investors in the entity) with economic exposure to the Mainland Chinese company that replicates equity ownership, without actual equity ownership of the Mainland Chinese operating company. The VIE contractual arrangements permit the VIE structure to consolidate its financial statements with those of the underlying Chinese companies. VIE structures are used due to Mainland Chinese government prohibitions on foreign ownership of companies in certain industries and it is not clear that the contracts are enforceable or that the structures will otherwise work as intended. Intervention by the Mainland Chinese government with respect to VIE structures could adversely affect the Mainland Chinese operating company’s performance, the enforceability of the offshore entity’s contractual arrangements with the Mainland Chinese company and the value of the offshore entity’s shares. If this were to occur, the market value of the Fund’s associated portfolio holdings would likely fall, causing substantial investment losses for the Fund. |
| EMEA (Europe Middle East Africa) Region Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | EMEA (Europe/Middle East/Africa) Region Risk. The economies of the EMEA countries in the Underlying Index are all considered emerging market economies. The democratization process in Eastern Europe is still relatively new, and political turmoil and uprising remains a threat. Recent examples include conflict, loss of life and disaster connected to ongoing armed conflict between Russia and Ukraine in Europe and Hamas and Israel in the Middle East. The extent, duration and impact of these conflicts, related sanctions and retaliatory actions are difficult to ascertain, but could be significant and have severe adverse effects on the region. Such conflicts may also result in significant refugee and migration flows, which may adversely impact foreign investor confidence in the affected countries and the broader region. Many Middle Eastern economies have little or no democratic tradition and are currently facing greater political and economic uncertainty, which could result in significant economic downturn. Many African nations have a history of dictatorship, military intervention and corruption. Russia, the Middle East and many African nations are also highly reliant on income from sales of commodities (such as oil), and their economies are therefore vulnerable to changes in the global prices of these commodities and currencies. As global demand for commodities fluctuates, the Russian economy and many Middle Eastern and African economies may be significantly impacted. |
| European Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | European Market Risk. The Fund’s performance will be affected by political, social and economic conditions in the various countries in which it invests in Europe and in Europe more generally, such as growth of the economic output (the gross national product), the rate of inflation, the rate at which capital is reinvested into European economies, the success of governmental actions to reduce budget deficits, the resource self-sufficiency of European countries and interest and monetary exchange rates between European countries. European financial markets may experience volatility due to concerns about high government debt levels, credit rating downgrades, rising unemployment, the future of the euro as a common currency, possible restructuring of government debt and other government measures responding to those concerns and fiscal and monetary controls imposed on member countries of the European Union. |
| India Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | India Risk. Government actions, bureaucratic obstacles and inconsistent economic reform within the Indian government have had a significant effect on the economy and could adversely affect market conditions, economic growth and the profitability of private enterprises. Global economic developments may inhibit the flow of foreign capital on which India is dependent to sustain its growth. Large portions of many Indian companies remain in the hands of individuals and corporate governance standards of Indian companies may be weaker and less transparent, which may increase the risk of loss and unequal treatment of investors. Investments in Indian securities may be limited or prevented, at times, due to the limits on foreign ownership imposed by the Reserve Bank of India. Investments in India are subject to risks presented by investments in an emerging market country, including liquidity risk, which may result in extreme volatility in the prices of Indian securities. Religious, cultural and military disputes persist in India, and between India and Pakistan (as well as between sectarian groups within each country). In addition, the Indian economy could be adversely impacted by natural disasters and acts of terrorism. Investments in India may be more likely to be affected by such events than investments in other geographic regions. Both India and Pakistan have tested nuclear arms, and the threat of deployment of such weapons could hinder development of the Indian economy, and escalating tensions could impact the broader region. |
| Latin American Market Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Latin American Market Risk. The economies of countries in Latin America are all considered emerging market economies. High interest, inflation (in some cases substantial and prolonged), and unemployment rates generally characterize each economy. Because commodities such as agricultural products, minerals, and metals represent a significant percentage of exports of many Latin American countries, the economies of those countries are particularly sensitive to fluctuations in commodity prices. Investments in the region may also be subject to currency risks, such as restrictions on the flow of money in and out of the country, extreme volatility relative to the U.S. dollar, and devaluation, all of which could decrease the value of the Fund. Governments of many Latin American countries exercise substantial influence over many aspects of the private sector, and any such exercise could have a significant effect on companies in which the Fund invests. Other Latin American market risks include foreign exchange controls, difficulties in pricing securities, defaults on sovereign debt, difficulties in enforcing favorable legal judgments in local courts, political and social instability and the significant percentage of the market represented by a small number of issuers. |
| Geographic Focus Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Geographic Focus Risk. The Fund may focus its investments in one or more regions or small groups of countries. As a result, the Fund’s performance may be subject to greater volatility than a more geographically diversified fund. |
| Sovereign Debt Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sovereign Debt Risk. The Fund may invest in securities issued or guaranteed by foreign governmental entities (known as sovereign debt securities). These investments are subject to the risk of payment delays or defaults, including where a sovereign issuer lacks the willingness to make timely payments, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, large debt positions relative to the country’s economy or failure to implement economic reforms. There is no legal or bankruptcy process for collecting sovereign debt. |
| Interest Rate Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Interest Rate Risk. The Fund’s investments in bonds and other debt securities will change in value based on changes in interest rates. If rates increase, the value of these investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value. The Fund may invest in floating rate loans and other variable and floating rate securities. Although these instruments are generally less sensitive to interest rate changes than fixed rate instruments, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The Fund may face a heightened level of interest rate risk due to certain changes in monetary policy. It is difficult to predict the pace at which central banks or monetary authorities may change interest rates or the timing, frequency, or magnitude of such changes. Any such changes could be sudden and could expose debt markets to significant volatility and reduced liquidity for Fund investments. |
| Credit Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Credit Risk. The Fund’s investments are subject to the risk that issuers, guarantors and/or counterparties will fail to make payments when due or default completely. Prices of the Fund’s investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. Credit spreads may increase, which may reduce the market values of the Fund’s securities. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities. |
| Index Related Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Index Related Risk. The Fund’s return may not track the return of the Underlying Index for a number of reasons and therefore may not achieve its investment objective. For example, the Fund incurs a number of operating expenses not applicable to the Underlying Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Underlying Index. These transaction costs may be higher for a Fund investing in foreign securities. In addition, the Fund’s return may differ from the return of the Underlying Index as a result of, among other things, pricing differences (including differences between a security’s price at the local market close and the Fund’s valuation of a security at the time of calculation of the Fund’s NAV) and the inability to purchase certain securities included in the Underlying Index due to regulatory or other restrictions. In addition, when the Fund uses a representative sampling approach, the Fund may not be as well correlated with the return of the Underlying Index as when the Fund purchases all of the securities in the Underlying Index in the proportions in which they are represented in the Underlying Index. To the extent the Fund calculates its NAV based on fair value prices and the value of the Underlying Index is based on securities’ closing prices on local foreign markets (i.e., the value of the Underlying Index is not based on fair value prices), the Fund’s ability to track the performance of the Underlying Index may be adversely affected. Errors in the construction or calculation of the Underlying Index may occur from time to time. Any such errors may not be identified and corrected by the Index Provider for some period of time, which may have an adverse impact on the Fund and its shareholders. The risk that the Fund may not track the performance of the Underlying Index may be heightened during times of increased market volatility or other unusual market conditions. |
| Passive Management Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Passive Management Risk. Unlike many investment companies, the Fund is not “actively” managed. Therefore, it would not generally sell a security because the security’s issuer was in financial trouble unless that security is removed from the Underlying Index. As a result, the Fund’s performance could be lower than funds that actively shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. The structure and composition of the Underlying Index will affect the performance, volatility, and risk of the Fund. The Fund will not take defensive positions under any market conditions, including in declining markets. |
| Sampling Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Sampling Risk. To the extent the Fund uses a representative sampling approach, it will hold a smaller number of securities than are in the Underlying Index. As a result, an adverse development respecting an issuer of securities held by the Fund could result in a greater decline in the Fund’s NAV than would be the case if the Fund held all of the securities in the Underlying Index. Conversely, a positive development relating to an issuer of securities in the Underlying Index that is not held by the Fund could cause the Fund to underperform the Underlying Index. To the extent the assets in the Fund are smaller, these risks may be greater. |
| High Yield Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | High Yield Securities Risk. The Fund invests in securities including junk bonds and instruments that are issued by companies that are highly leveraged, less creditworthy or financially distressed. These investments are considered to be speculative and may be subject to greater risk of loss (including substantial or total loss), greater sensitivity to economic changes, valuation difficulties and potential illiquidity. Such investments may be subject to additional risks including subordination to other creditors, no collateral or limited rights in collateral, lack of a regular trading market, liquidity risks, prepayment risks, and lack of publicly available information. High yield securities that are deemed to be liquid at the time of purchase may become illiquid. In recent years, there has been a broad trend of weaker or less restrictive covenant protections in the high yield market. Among other things, under such weaker or less restrictive covenants, borrowers might be able to exercise more flexibility with respect to certain activities than borrowers who are subject to stronger or more protective covenants. For example, borrowers might be able to incur more debt, including secured debt, return more capital to shareholders, remove or reduce assets that are designated as collateral securing high yield securities, increase the claims against assets that are permitted against collateral securing high yield securities or otherwise manage their business in ways that could impact creditors negatively. In addition, certain privately held borrowers might be permitted to file less frequent, less detailed or less timely financial reporting or other information, which could negatively impact the value of the high yield securities issued by such borrowers. Each of these factors might negatively impact the high yield instruments held by the Fund. No active trading market may exist for some instruments and certain investments may be subject to restrictions on resale. The inability to dispose of the Fund’s securities and other investments in a timely fashion could result in losses to the Fund. Because some instruments may have a more limited secondary market, liquidity and valuation risk may be more pronounced for the Fund. When instruments are prepaid, the Fund may have to reinvest in instruments with a lower yield or fail to recover additional amounts (i.e., premiums) paid for these instruments, resulting in an unexpected capital loss and/or a decrease in the amount of dividends and yield. |
| Derivatives Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Derivatives Risk. Derivatives, including futures contracts, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. Certain derivatives expose the Fund to counterparty risk, which is the risk that the derivative counterparty will not fulfill its contractual obligations (and includes credit risk associated with the counterparty). Certain derivatives are synthetic instruments that attempt to replicate the performance of certain reference assets. With regard to such derivatives, the Fund does not have a claim on the reference assets and is subject to enhanced counterparty risk. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation. Derivatives also can expose the Fund to derivative liquidity risk, which includes risks involving the liquidity demands that derivatives can create to make payments of margin, collateral, or settlement payments to counterparties, legal risk, which includes the risk of loss resulting from insufficient or unenforceable contractual documentation, insufficient capacity or authority of the Fund’s counterparty and operational risk, which includes documentation or settlement issues, system failures, inadequate controls and human error. Certain of the Fund’s transactions in foreign currency derivatives and other derivatives could also affect the amount, timing and character of distributions to shareholders which may result in the Fund realizing more ordinary income and short-term capital gain subject to tax at ordinary income tax rates than it would if it did not engage in such transactions, which may adversely impact the Fund’s after-tax returns. |
| Privately Placed Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Privately Placed Securities Risk. Privately placed securities generally are less liquid than publicly traded securities and the Fund may not always be able to sell such securities without experiencing delays in finding buyers or reducing the sale price for such securities. The disposition of some of the securities held by the Fund may be restricted under federal securities laws. As a result, the Fund may not be able to dispose of such investments at a time when, or at a price at which, it desires to do so and may have to bear expenses of registering these securities, if necessary. These securities may also be difficult to value. |
| Prepayment Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Prepayment Risk. The issuer of certain securities may repay principal in advance, especially when yields fall. Changes in the rate at which prepayments or redemptions occur can affect the return on investment of these securities. When debt obligations are prepaid or when securities are called, the Fund may have to reinvest in securities with a lower yield. The Fund also may fail to recover additional amounts (i.e., premiums) paid for securities with higher coupons, resulting in an unexpected capital loss. |
| Structured Investment Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Structured Investment Risk. Certain structured investments including credit default swaps are synthetic instruments that attempt to replicate the performance of certain reference assets. With regard to such instruments, the Fund does not have a claim on the reference assets and is subject to enhanced counterparty risk. |
| ETF Shares Trading Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | ETF Shares Trading Risk. Shares are listed for trading on the NYSE Arca, Inc. (the Exchange) and are bought and sold in the secondary market at market prices. The market prices of Shares are expected to fluctuate, in some cases materially, in response to changes in the Fund’s NAV, the intraday value of the Fund’s holdings and supply and demand for Shares. The adviser cannot predict whether Shares will trade above, below or at their NAV. Disruptions to creations and redemptions, the existence of significant market volatility or potential lack of an active trading market for the Shares (including through a trading halt), as well as other factors, may result in the Shares trading significantly above (at a premium) or below (at a discount) to NAV or to the intraday value of the Fund’s holdings. During such periods, you may incur significant losses if you sell your Shares. The securities held by the Fund may be traded in markets that close at a different time than the Exchange. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the Exchange is open but after the applicable market closing, fixing or settlement times, bid-ask spreads on the Exchange and the corresponding premium or discount to the Shares’ NAV may widen. |
| Authorized Participant Concentration Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | 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 intermediaries that act as authorized participants and none of these authorized participants is or will be obligated to engage in creation or redemption transactions. The Fund has a limited number of institutions that may act as authorized participants on an agency basis (i.e., on behalf of other market participants). To the extent that these intermediaries exit the business or are unable to or choose not to proceed with creation and/or redemption orders with respect to the Fund and no other authorized participant creates or redeems, Shares may trade at a discount to NAV and possibly face trading halts and/or delisting. Authorized participant concentration risk may be heightened for exchange-traded funds (ETFs) that invest in securities issued by non-U.S. issuers. |
| Industry and Sector Focus Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Industry and Sector Focus Risk. At times, the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of securities of issuers in a particular industry or sector may be more susceptible to fluctuations due to changes in economic or business conditions, government regulations, availability of basic resources or supplies, contagion risk within a particular industry or sector or to other industries or sectors, or other events that affect that industry or sector more than securities of issuers in other industries and sectors. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, the value of the Fund’s Shares may fluctuate in response to events affecting that industry or sector. |
| Non-Diversified Fund Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Non-Diversified Fund Risk. Since the Fund is non-diversified, it may invest a greater percentage of its assets in a particular issuer or group of issuers than a diversified fund would. This increased investment in fewer issuers may result in the Fund’s Shares being more sensitive to economic results of those issuing the securities. The value of the Fund’s Shares may also be more volatile than the value of a fund which invests in more securities. |
| Risk Lose Money [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | You could lose money investing in the Fund. |
| Risk Not Insured Depository Institution [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Investments in the Fund are not deposits or obligations of, or guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency. |