High Yield Municipal ETF Investment Strategy - High Yield Municipal ETF	Feb. 28, 2026
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>
Strategy Narrative [Text Block]	Under normal circumstances, the Fund invests at least 80% of its Assets in municipal securities, the income from which is exempt from federal income tax. This is a fundamental policy. For purposes of this policy, “Assets” means net assets, plus the amount of borrowings for investment purposes. Up to 25% of the Fund’s Assets may be invested in municipal securities, the interest on which may be subject to the federal alternative minimum tax for individuals. Municipal securities are securities issued by or on behalf of states, territories and possessions of the United States, including the District of Columbia, and their respective authorities, political subdivisions, agencies and instrumentalities and other groups with the authority to act for the municipalities, the interest on which is exempt from federal income tax. The securities are issued to raise funds for various public and private purposes. Municipal securities may include, but are not limited to, variable rate demand obligations, short-term municipal notes, municipal bonds, tax exempt commercial paper, private activity and industrial development bonds, tax anticipation notes, and participations in pools of municipal securities. Municipal securities also include instruments evidencing direct ownership of interest payments or principal payments, or both, on municipal securities, such as tender option bonds and participation interests in all or part of specific holdings of municipal obligations, provided that the applicable issuer receives assurances from legal counsel that the interest payable on the securities is exempt from federal income tax. Additionally, municipal securities include all other instruments that directly or indirectly provide economic exposure to income which is derived from municipalities (such as municipal leases). The securities in which the Fund invests may have fixed rates of return or floating or variable rates. The Fund will invest in municipal securities of any maturity. As part of its investments in municipal securities, the Fund will also have the ability to invest up to 100% of the Fund’s total assets in below investment grade or unrated securities. Such securities are also known as “junk bonds,” “high yield bonds” and “non-investment grade bonds.” Junk bonds also include unrated securities that the Fund’s adviser believes to be of comparable quality to debt securities that are rated below investment grade. These securities generally are rated in the fifth or lower rating categories (for example, BB+ or lower by S&P Global Ratings (S&P) and Ba1 or lower by Moody’s Investors Service Inc. (Moody’s)). These securities generally offer a higher yield than investment grade securities, but involve a high degree of risk. A security’s quality is determined at the time of purchase and securities that are rated investment grade or the unrated equivalent may be downgraded or decline in credit quality such that subsequently they would be deemed to be below investment grade.The Fund will also invest in investment grade securities. Investment grade securities carry a minimum rating of Baa3, BBB–, or BBB– by Moody’s, S&P, or Fitch Ratings (Fitch), respectively, or the equivalent by another nationally recognized statistical rating organization (NRSRO) or are unrated but deemed by the adviser to be of comparable quality. Under normal market conditions, the Fund intends to invest a significant portion of its Assets in securities rated BBB/BB by S&P and Fitch, Baa/Ba by Moody’s or unrated securities that the adviser deems to be of equivalent quality. The Fund may also invest in common shares or preferred shares of unaffiliated closed-end funds. The Fund generally will limit its investments in a single closed-end fund to 5% of its total assets and in all registered investment companies including closed-end funds (other than money market funds) to 10% of its total assets. The Fund may invest in shares of exchange-traded funds (ETFs). The ETFs in which the Fund may invest include registered investment companies that seek to track the performance of a particular market index or security. These indexes include not only broad-based market indexes but more specific indexes as well, including those relating to particular sectors, markets, regions or industries. Ordinarily, the Fund must limit its investments in a single ETF to 5% of its total assets and in all ETFs and other investment companies to 10% of its total assets. However, the Securities and Exchange Commission (SEC) adopted an exemptive rule that allows any fund to disregard these 5% and 10% limitations, subject to certain conditions. The Fund may invest in obligations of the U.S. Treasury, including Treasury bills, bonds and notes. These investments carry different interest rates, maturities and issue dates. The interest on these securities may be exempt from state and local income taxes. Up to 20% of the Fund’s net assets may be invested in securities subject to federal income tax. The Fund may also invest in zero-coupon securities, Treasury futures and credit default swaps as part of its main investment strategy. The Fund also invests in inverse floaters and restricted securities.Investment Process: The adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors. Taking a long-term approach, the adviser primarily looks for individual fixed income investments that it believes will perform well over market cycles. The adviser is value oriented and makes investment decisions after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, any security pledge, and a review of the security’s attributes, such as the coupon, maturity, and any redemption and tender provisions. The adviser also factors in the overall investment strategy of the Fund, including its duration and its credit strategy, as well as the adviser’s interest rate outlook. As part of its investment process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on certain issuers in the universe in which the Fund may invest. The adviser’s assessment is based on an analysis of key opportunities and risks across industries to seek to identify financially material issues with respect to the Fund’s investments in municipal issues and ascertain key issues that merit engagement with municipal issuers. These assessments may not be conclusive and securities of issuers that may be negatively impacted by such factors may be purchased and retained by the Fund while the Fund may divest or not invest in securities of issuers that may be positively impacted by such factors.

High Yield Municipal ETF Investment Strategy - High Yield Municipal ETF

Feb. 28, 2026

<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>

Strategy Narrative [Text Block]

Under normal circumstances, the Fund invests at least 80% of its Assets in municipal securities, the income from which is exempt from federal income tax. This is a fundamental policy. For purposes of this policy, “Assets” means net assets, plus the amount of borrowings for investment purposes. Up to 25% of the Fund’s Assets may be invested in municipal securities, the interest on which may be subject to the federal alternative minimum tax for individuals. Municipal securities are securities issued by or on behalf of states, territories and possessions of the United States, including the District of Columbia, and their respective authorities, political subdivisions, agencies and instrumentalities and other groups with the authority to act for the municipalities, the interest on which is exempt from federal income tax. The securities are issued to raise funds for various public and private purposes. Municipal securities may include, but are not limited to, variable rate demand obligations, short-term municipal notes, municipal bonds, tax exempt commercial paper, private activity and industrial development bonds, tax anticipation notes, and participations in pools of municipal securities. Municipal securities also include instruments evidencing direct ownership of interest payments or principal payments, or both, on municipal securities, such as tender option bonds and participation interests in all or part of specific holdings of municipal obligations, provided that the applicable issuer receives assurances from legal counsel that the interest payable on the securities is exempt from federal income tax. Additionally, municipal securities include all other instruments that directly or indirectly provide economic exposure to income which is derived from municipalities (such as municipal leases). The securities in which the Fund invests may have fixed rates of return or floating or variable rates. The Fund will invest in municipal securities of any maturity. As part of its investments in municipal securities, the Fund will also have the ability to invest up to 100% of the Fund’s total assets in below investment grade or unrated securities. Such securities are also known as “junk bonds,” “high yield bonds” and “non-investment grade bonds.” Junk bonds also include unrated securities that the Fund’s adviser believes to be of comparable quality to debt securities that are rated below investment grade. These securities generally are rated in the fifth or lower rating categories (for example, BB+ or lower by S&P Global Ratings (S&P) and Ba1 or lower by Moody’s Investors Service Inc. (Moody’s)). These securities generally offer a higher yield than investment grade securities, but involve a high degree of risk. A security’s quality is determined at the time of purchase and securities that are rated investment grade or the unrated equivalent may be downgraded or decline in credit quality such that subsequently they would be deemed to be below investment grade.The Fund will also invest in investment grade securities. Investment grade securities carry a minimum rating of Baa3, BBB–, or BBB– by Moody’s, S&P, or Fitch Ratings (Fitch), respectively, or the equivalent by another nationally recognized statistical rating organization (NRSRO) or are unrated but deemed by the adviser to be of comparable quality. Under normal market conditions, the Fund intends to invest a significant portion of its Assets in securities rated BBB/BB by S&P and Fitch, Baa/Ba by Moody’s or unrated securities that the adviser deems to be of equivalent quality. The Fund may also invest in common shares or preferred shares of unaffiliated closed-end funds. The Fund generally will limit its investments in a single closed-end fund to 5% of its total assets and in all registered investment companies including closed-end funds (other than money market funds) to 10% of its total assets. The Fund may invest in shares of exchange-traded funds (ETFs). The ETFs in which the Fund may invest include registered investment companies that seek to track the performance of a particular market index or security. These indexes include not only broad-based market indexes but more specific indexes as well, including those relating to particular sectors, markets, regions or industries. Ordinarily, the Fund must limit its investments in a single ETF to 5% of its total assets and in all ETFs and other investment companies to 10% of its total assets. However, the Securities and Exchange Commission (SEC) adopted an exemptive rule that allows any fund to disregard these 5% and 10% limitations, subject to certain conditions. The Fund may invest in obligations of the U.S. Treasury, including Treasury bills, bonds and notes. These investments carry different interest rates, maturities and issue dates. The interest on these securities may be exempt from state and local income taxes. Up to 20% of the Fund’s net assets may be invested in securities subject to federal income tax. The Fund may also invest in zero-coupon securities, Treasury futures and credit default swaps as part of its main investment strategy. The Fund also invests in inverse floaters and restricted securities.Investment Process: The adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors. Taking a long-term approach, the adviser primarily looks for individual fixed income investments that it believes will perform well over market cycles. The adviser is value oriented and makes investment decisions after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, any security pledge, and a review of the security’s attributes, such as the coupon, maturity, and any redemption and tender provisions. The adviser also factors in the overall investment strategy of the Fund, including its duration and its credit strategy, as well as the adviser’s interest rate outlook. As part of its investment process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on certain issuers in the universe in which the Fund may invest. The adviser’s assessment is based on an analysis of key opportunities and risks across industries to seek to identify financially material issues with respect to the Fund’s investments in municipal issues and ascertain key issues that merit engagement with municipal issuers. These assessments may not be conclusive and securities of issuers that may be negatively impacted by such factors may be purchased and retained by the Fund while the Fund may divest or not invest in securities of issuers that may be positively impacted by such factors.