GAMCO Global Gold, Natural Resources & Income Trust (GGN)
Company Profile
| N-2 - USD ($) | 3 Months Ended | 12 Months Ended | |||||||||||||||||
| Dec. 31, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | |
| Cover [Abstract] | |||||||||||||||||||
| Entity Central Index Key | 0001313510 | ||||||||||||||||||
| Amendment Flag | false | ||||||||||||||||||
| Document Type | N-CSR | ||||||||||||||||||
| Entity Registrant Name | GAMCO Global Gold, Natural Resources & Income Trust | ||||||||||||||||||
| Fee Table [Abstract] | |||||||||||||||||||
| Shareholder Transaction Expenses [Table Text Block] | Shareholder Transaction Expenses Sales Load (as a percentage of offering price) - % (a) Offering Expenses Borne by the Fund - % (a) Dividend Reinvestment and Voluntary Cash Purchase Plan Fees Purchase Transactions $ 1.00 (b) | ||||||||||||||||||
| Sales Load [Percent] | (0.00%) | ||||||||||||||||||
| Dividend Reinvestment and Cash Purchase Fees | $ 1 | ||||||||||||||||||
| Other Transaction Expenses [Abstract] | |||||||||||||||||||
| Other Transaction Expenses [Percent] | (0.00%) | ||||||||||||||||||
| Annual Expenses [Table Text Block] | Annual Expenses (as a percentage of net assets attributable to common shares) Percentages of Net Assets Management Fees 1.14 % (c) Other Expenses 0.25 % (c) Total Annual Expenses 1.39 % Dividends on Preferred Shares 0.68 % (d) Total Annual Expenses and Dividends on Preferred Shares 2.07 % | ||||||||||||||||||
| Management Fees [Percent] | 1.14% | ||||||||||||||||||
| Other Annual Expenses [Abstract] | |||||||||||||||||||
| Other Annual Expense 3 [Percent] | 0.25% | ||||||||||||||||||
| Total Annual Expenses [Percent] | 1.39% | ||||||||||||||||||
| Waivers and Reimbursements of Fees [Percent] | 0.68% | ||||||||||||||||||
| Net Expense over Assets [Percent] | 2.07% | ||||||||||||||||||
| Expense Example [Table Text Block] | The following example illustrates the expenses you would pay on a $1,000 investment in common shares, assuming a 5% annual portfolio total return.* The actual amounts in connection with any offering will be set forth in the Prospectus Supplement if applicable. 1 Year 3 Year 5 Year 10 Year Total Expenses Incurred $21 $65 $111 $240 ** The example should not be considered a representation of future expenses. The example is based on total Annual Expenses and Dividends on Preferred Shares shown in the table above and assumes that the amounts set forth in the table do not change and that all distributions are reinvested at net asset value. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be greater or less than the hypothetical 5% return shown in the example. The example includes Dividends on Preferred Shares. If Dividends on Preferred Shares were not included in the example calculation, the expenses for the 1-, 3-, 5- and 10-year periods in the table above would be as follows (based on the same assumptions as above): $ 14 44 76 167 | ||||||||||||||||||
| Expense Example, Year 01 | $ 21 | ||||||||||||||||||
| Expense Example, Years 1 to 3 | 65 | ||||||||||||||||||
| Expense Example, Years 1 to 5 | 111 | ||||||||||||||||||
| Expense Example, Years 1 to 10 | $ 240 | ||||||||||||||||||
| Purpose of Fee Table , Note [Text Block] | The following table shows the Fund’s expenses, including preferred shares offering expenses, as a percentage of net assets attributable to common shares. All expenses of the Fund are borne, directly or indirectly, by the common shareholders. The table is based on the capital structure of the Fund as of December 31, 2023. The purpose of the table and example below is to help you understand all fees and expenses that you, as a holder of common shares, would bear directly or indirectly. | ||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Investment Objectives and Practices [Text Block] | INVESTMENT OBJECTIVES AND POLICIES Investment Objectives The Fund’s primary investment objective is to provide a high level of current income. The Fund’s secondary investment objective is to seek capital appreciation consistent with the Fund’s strategy and its primary objective. Under normal market conditions, the Fund will attempt to achieve its objectives by investing at least 80% of its assets in equity securities of companies principally engaged in the gold industry and the natural resources industries. The Fund will invest at least 25% of its assets in the equity securities of companies principally engaged in the gold industry, which includes companies principally engaged in the exploration, mining, fabrication, processing, distribution or trading of gold or the financing, managing, controlling or operating of companies engaged in “gold-related” activities. In addition, the Fund will invest at least 25% of its assets in the equity securities of companies principally engaged in the group of industries that constitute the natural resources industries, which include companies principally engaged in the exploration, production or distribution of natural resources, such as gas, oil, paper, food and agriculture, forestry products, metals (other than gold) and minerals as well as related transportation companies and equipment manufacturers. The Fund may invest in the securities of companies located anywhere in the world. Under normal market conditions, the Fund will invest at least 40% of its assets in the securities of issuers located in at least three countries other than the United States. For this purpose an issuer will be treated as located outside the United States if it is either organized or headquartered outside the United States and has a substantial portion of its operations or sales outside the United States. Equity securities may include common stocks, preferred stocks, convertible securities, warrants, depository receipts and equity interests in trusts and other entities. Other Fund investments may include investment companies, securities of issuers subject to reorganization or other risk arbitrage investments, certain derivative instruments, debt (including obligations of the United States government) and money market instruments. The Fund may invest up to 10% of its total assets in securities rated below investment grade by recognized statistical rating agencies or unrated securities of comparable quality, including securities of issuers in default, which are likely to have the lowest rating. These securities, which may be preferred shares or debt, are predominantly speculative and involve major risk exposure to adverse conditions. Securities that are rated lower than “BBB” by S&P, or lower than “Baa” by Moody’s or unrated securities considered by the Investment Adviser to be of comparable quality, are commonly referred to as “junk bonds” or “high yield” securities. As part of its investment strategy, the Fund intends to generate gains through an option strategy of writing (selling) covered call options on equity securities in its portfolio. When the Fund sells a covered call option, it generates gains in the form of the premium paid by the buyer of the call option, but the Fund forgoes the opportunity to participate in any increase in the value of the underlying equity security above the exercise price of the option. There can be no assurance that the Fund will achieve its investment objectives. Investment Methodology of the Fund In selecting securities for the Fund, the Investment Adviser normally considers the following factors, among others: ● The industry of the issuer of a security; ● the potential of the Fund to earn gains from writing covered call options on such securities; ● the interest or dividend income generated by the securities; ● the potential for capital appreciation of the securities; ● the prices of the securities relative to comparable securities; ● whether the securities are entitled to the benefits of call protection or other protective covenants; ● the existence of any anti-dilution protections or guarantees of the security; and ● the number and size of investments of the portfolio as to issuers. The Investment Adviser’s investment philosophy with respect to selecting investments in the gold industry and the natural resources industries is to emphasize quality and value, as determined by such factors as asset quality, balance sheet leverage, management ability, reserve life, cash flow, and commodity hedging exposure. In addition, in making stock selections, the Investment Adviser looks for securities that it believes may have a superior yield as well as capital gains potential. Current Investment Practices Gold Industry Concentration In selecting investments in Gold Companies for the Fund, the Investment Adviser will focus on stocks that are undervalued, but which appear to have favorable prospects for growth. Factors considered in this determination will include capitalization per ounce of gold production, capitalization per ounce of recoverable reserves, quality of management and ability to create shareholder wealth. Because most of the world’s gold production is outside of the United States, the Fund may have a significant portion of its investments in Gold Companies in securities of foreign issuers, including those located in developed as well as emerging markets. The percentage of Fund assets invested in particular countries or regions will change from time to time based on the Investment Adviser’s judgment. Among other things, the Investment Adviser will consider the economic stability and economic outlook of these countries and regions. See “Risk Factors and Special Considerations—Industry Risks.” Natural Resources Industries Concentration. Under normal market conditions, the Fund will invest at least 25% of its assets in equity securities of Natural Resources Companies. “Natural Resources Companies” are those that are principally engaged in the group of industries that constitute the natural resources industries, which include companies principally engaged in the exploration, production or distribution of energy or natural resources, such as gas, oil, paper, food and agriculture, forestry products, metals (other than gold) and minerals as well as related transportation companies and equipment manufacturers.” Principally engaged, as used in this Annual Report, means a company that derives at least 50% of its revenues or earnings or devotes at least 50% of its assets to gold or natural resources related activities, as the case may be. Covered Calls and Other Option Transactions. A put option is the reverse of a call option, giving the buyer the right, in return for a premium, to sell the underlying security to the writer, at a specified price, and obligating the writer to purchase the underlying security from the holder at that price. When the Fund sells a put option, it generates gains in the form of the premium paid by the buyer of the put option, but the Fund will have the obligation to buy the underlying security at the exercise price if the price of the security decreases below the exercise price of the option. If the Fund has written a call option, it may terminate its obligation by effecting a closing purchase transaction. This is accomplished by purchasing a call option with the same terms as the option previously written. However, once the Fund has been assigned an exercise notice, the Fund will be unable to effect a closing purchase transaction. Similarly, if the Fund is the holder of an option, it may liquidate its position by effecting a closing sale transaction. This is accomplished by selling an option with the same terms as the option previously purchased. There can be no assurance that either a closing purchase or sale transaction can be effected when the Fund so desires. The Fund will realize a profit from a closing transaction if the price of the transaction is less than the premium it received from writing the option or is more than the premium it paid to purchase the option; the Fund will realize a loss from a closing transaction if the price of the transaction is more than the premium it received from writing the option or is less than the premium it paid to purchase the option. Since call option prices generally reflect increases in the price of the underlying security, any loss resulting from the repurchase of a call option may also be wholly or partially offset by unrealized appreciation of the underlying security. Other principal factors affecting the market value of a put or a call option include supply and demand, interest rates, the current market price and price volatility of the underlying security and the time remaining until the expiration date of the option. Gains and losses on investments in options depend, in part, on the ability of the Investment Adviser to predict correctly the effect of these factors. The use of options cannot serve as a complete hedge since the price movement of securities underlying the options will not necessarily follow the price movements of the portfolio securities subject to the hedge. An option position may be closed out only on an exchange that provides a secondary market for an option with the same terms or in a private transaction. Although the Fund will generally purchase or write options for which there appears to be an active secondary market, there is no assurance that a liquid secondary market on an exchange will exist for any particular option. In such event, it might not be possible to effect closing transactions in particular options, in which case the Fund would have to exercise its options in order to realize any profit and would incur brokerage commissions upon the exercise of call options and upon the subsequent disposition of underlying securities for the exercise of put options. Although the Investment Adviser will attempt to take appropriate measures to minimize the risks relating to the Fund’s writing and purchasing of put and call options, there can be no assurance that the Fund will succeed in any option-writing program it undertakes. See “Risk Factors and Special Considerations—Risks Associated with Covered Calls and Other Options.” Foreign Securities The Fund may also purchase sponsored American Depository Receipts (“ADRs”) or U.S. dollar denominated securities of foreign issuers. ADRs are receipts issued by U.S. banks or trust companies in respect of securities of foreign issuers held on deposit for use in the U.S. securities markets. Emerging Markets Emerging market countries generally include every nation in the world except the United States, Canada, Japan, Australia, New Zealand and most countries located in Western Europe. Registered Investment Companies. The Fund may invest in registered investment companies in accordance with the 1940 Act, to the extent consistent with the Fund’s investment objectives, including exchange traded funds that concentrate in investments in the gold or natural resources industries. The 1940 Act generally prohibits the Fund from investing more than 5% of its assets in any one other investment company or more than 10% of its assets in all other investment companies. However, many exchange-traded funds are exempt from these limitations. Illiquid Investments. It may be difficult to sell such securities at a price representing the fair value until such time as such securities may be sold publicly. Where registration is required, a considerable period may elapse between a decision to sell the securities and the time when it would be permitted to sell. Thus, the Fund may not be able to obtain as favorable a price as that prevailing at the time of the decision to sell. The Fund may also acquire securities through private placements under which it may agree to contractual restrictions on the resale of such securities. Such restrictions might prevent their sale at a time when such sale would otherwise be desirable. Income Securities. The Fund may invest in other equity securities that are expected to periodically accrue or generate income for their holders such as common and preferred stocks of issuers that have historically paid periodic dividends or otherwise made distributions to stockholders. Unlike fixed income securities, dividend payments generally are not guaranteed and so may be discontinued by the issuer at its discretion or because of the issuer’s inability to satisfy its liabilities. Further, an issuer’s history of paying dividends does not guarantee that it will continue to pay dividends in the future. In addition to dividends, under certain circumstances the holders of common stock may benefit from the capital appreciation of the issuer. Common stocks represent the residual ownership interest in the issuer and holders of common stock are entitled to the income and increase in the value of the assets and business of the issuer after all of its debt obligations and obligations to preferred shareholders are satisfied. Common stocks generally have voting rights. Common stocks fluctuate in price in response to many factors including historical and prospective earnings of the issuer, the value of its assets, general economic conditions, interest rates, investor perceptions and market liquidity. In addition, the Fund also may invest in fixed income securities such as convertible securities, bonds, debentures, notes, preferred stock, short-term discounted Treasury Bills or certain securities of the U.S. government sponsored instrumentalities, as well as money market open-end funds that invest in those securities, which, in the absence of an applicable exemptive order, will not be affiliated with the Investment Adviser. Fixed income securities obligate the issuer to pay to the holder of the security a specified return, which may be either fixed or reset periodically in accordance with the terms of the security. Fixed income securities generally are senior to an issuer’s common stock and their holders generally are entitled to receive amounts due before any distributions are made to common shareholders. Common stocks, on the other hand, generally do not obligate an issuer to make periodic distributions to holders. The Fund may also invest in obligations of government sponsored instrumentalities. Unlike non-U.S. government securities, obligations of certain agencies and instrumentalities of the U.S. government, such as the Government National Mortgage Association, are supported by the “full faith and credit” of the U.S. government; others, such as those of the Export-Import Bank of the U.S., are supported by the right of the issuer to borrow from the U.S. Treasury; others, such as those of the Federal National Mortgage Association, are supported by the discretionary authority of the U.S. government to purchase the agency’s obligations; and still others, such as those of the Student Loan Marketing Association, are supported only by the credit of the instrumentality. No assurance can be given that the U.S. government would provide financial support to U.S. government sponsored instrumentalities if it is not obligated to do so by law. Although the Fund may invest in all types of obligations of agencies and instrumentalities of the United States government, the Fund currently intends to invest only in obligations of government sponsored instrumentalities that are supported by the “full faith and credit” of the U.S. government. When Issued, Delayed Delivery Securities and Forward Commitments. The Fund may enter into forward commitments for the purchase or sale of securities, including on a “when issued” or “delayed delivery” basis, in excess of customary settlement periods for the type of security involved. In some cases, a forward commitment may be conditioned upon the occurrence of a subsequent event, such as approval and consummation of a merger, corporate reorganization or debt restructuring (i.e., a when, as and if issued security). When such transactions are negotiated, the price is fixed at the time of the commitment, with payment and delivery taking place in the future, generally a month or more after the date of the commitment. While it will only enter into a forward commitment with the intention of actually acquiring the security, the Fund may sell the security before the settlement date if it is deemed advisable. Securities purchased under a forward commitment are subject to market fluctuation, and no interest (or dividends) accrues to the Fund prior to the settlement date. Short Sales Short sales “against the box” are subject to special tax rules, one of the effects of which may be to accelerate the recognition of income by the Fund. Other than with respect to short sales against the box, the Fund will limit short sales of securities to not more than 5% of the Fund’s assets. When the Fund makes a short sale, it must deliver the security to the broker-dealer through which it made the short sale in order to satisfy its obligation to deliver the security upon conclusion of the sale. Repurchase Agreements Fund is delayed in or prevented from exercising its rights to dispose of the collateral securities, including the risk of a possible decline in the value of the underlying securities during the period in which it seeks to assert these rights. The Investment Adviser, acting under the supervision of the Board, reviews the creditworthiness of those banks and dealers with which the Fund enters into repurchase agreements to evaluate these risks, and monitors on an ongoing basis the value of the securities subject to repurchase agreements to ensure that the value is maintained at the required level. The Fund does not enter into repurchase agreements with the Investment Adviser or any of its affiliates. Convertible Securities The Fund is also permitted to invest in certain other securities with innovative structures in the convertible securities market. These include “mandatory conversion” securities, which consist of debt securities or preferred stocks that convert automatically into equity securities of the same or a different issuer at a specified date and conversion ratio. The market value of a convertible security may be viewed as comprised of two components: its “investment value,” which is its value based on its yield without regard to its conversion feature; and its “conversion value,” which is its value attributable to the underlying common stock obtainable on conversion. The investment value of a convertible security is influenced by changes in interest rates and the yield of similar non-convertible securities, with investment value declining as interest rates increase and increasing as interest rates decrease. The conversion value of a convertible security is influenced by changes in the market price of the underlying common stock. If, because of a low price of the underlying common stock, the conversion value is low relative to the investment value, the price of the convertible security is governed principally by its investment value. To the extent the market price of the underlying common stock approaches or exceeds the conversion price, the convertible security will be increasingly influenced by its conversion value, and the convertible security may sell at a premium over its conversion value to the extent investors place value on the right to acquire the underlying common stock while holding a fixed income security. Accordingly, convertible securities have unique investment characteristics because (i) they have relatively high yields as compared to common stocks, (ii) they have defensive characteristics since they provide a fixed return even if the market price of the underlying common stock declines, and (iii) they provide the potential for capital appreciation if the market price of the underlying common stock increases. A convertible security may be subject to redemption at the option of the issuer at a price established in the charter provision or indenture pursuant to which the convertible security is issued. If a convertible security held by the Fund is called for redemption, the Fund will be required to surrender the security for redemption, convert it into the underlying common stock or sell it to a third party. Additionally, there may be additional types of convertible securities with features not specifically referred to herein in which the Fund may invest consistent with its investment objectives and policies. For a discussion of risk factors of convertible securities, see “Risk Factors and Special Considerations— Convertible Securities Risk.” Non-Investment Grade Securities Generally, such non-investment grade securities and unrated securities of comparable quality offer a higher current yield than is offered by higher rated securities, but also (i) will likely have some quality and protective characteristics that, in the judgment of the rating organizations, are outweighed by large uncertainties or major risk exposures to adverse conditions and (ii) are predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal in accordance with the terms of the obligation. The market values of certain of these securities also tend to be more sensitive to individual corporate developments and changes in economic conditions than higher quality securities. In addition, such non-investment grade securities and comparable unrated securities generally present a higher degree of credit risk. The risk of loss due to default by these issuers is significantly greater because such non-investment grade securities and unrated securities of comparable quality generally are unsecured and frequently are subordinated to the prior payment of senior indebtedness. In light of these risks, the Investment Adviser, in evaluating the creditworthiness of an issue, whether rated or unrated, will take various factors into consideration, which may include, as applicable, the issuer’s operating history, financial resources and its sensitivity to economic conditions and trends, the market support for the facility financed by the issue, the perceived ability and integrity of the issuer’s management and regulatory matters. In addition, the market value of non-investment grade securities is more volatile than that of higher quality securities, and the markets in which such lower rated or unrated securities are traded are more limited than those in which higher rated securities are traded. The existence of limited markets may make it more difficult for the Fund to obtain accurate market quotations for purposes of valuing its portfolio and calculating its net asset value. Moreover, the lack of a liquid trading market may restrict the availability of securities for the Fund to purchase and may also have the effect of limiting the ability of the Fund to sell securities at their fair value in order to respond to changes in the economy or the financial markets. Non-investment grade and unrated securities of comparable quality also present risks based on payment expectations. If an issuer calls the obligation for redemption (often a feature of fixed income securities), the Fund may have to replace the security with a lower yielding security, resulting in a decreased return for investors. Also, as the principal value of bonds moves inversely with movements in interest rates, in the event of rising interest rates the value of the securities held by the Fund may decline proportionately more than a portfolio consisting of higher rated securities. Investments in zero coupon bonds may be more speculative and subject to greater fluctuations in value due to changes in interest rates than bonds that pay interest currently. Any interest rate increases in the future could cause the value of the Fund to decrease. Recently, inflation levels have been at their highest point in nearly 40 years and the Federal Reserve has been engaged in a campaign to raise certain benchmark interest rates in an effort to combat inflation. As inflation increases, the real value of the Fund’s common stock and distributions therefore may decline. The Fund may purchase securities of companies that are experiencing significant financial or business difficulties, including companies involved in bankruptcy or other reorganization and liquidation proceedings. Although such investments may result in significant financial returns to the Fund, they involve a substantial degree of risk. The level of analytical sophistication, both financial and legal, necessary for successful investments in issuers experiencing significant business and financial difficulties is unusually high. There can be no assurance that the Fund will correctly evaluate the value of the assets collateralizing its investments or the prospects for a successful reorganization or similar action. In any reorganization or liquidation proceeding relating to a portfolio investment, the Fund may lose all or part of its investment or may be required to accept collateral with a value less than the amount of the Fund’s initial investment. As part of its investments in non-investment grade securities, the Fund may invest without limit in securities of issuers in default. The Fund will make an investment in securities of issuers in default only when the Investment Adviser believes that such issuers will honor their obligations or emerge from bankruptcy protection and the value of these securities will appreciate. By investing in securities of issuers in default, the Fund bears the risk that these issuers will not continue to honor their obligations or emerge from bankruptcy protection or that the value of the securities will not otherwise appreciate. In addition to using recognized rating agencies and other sources, the Investment Adviser also performs its own analysis of issuers in seeking investments that it believes to be underrated (and thus higher yielding) in light of the financial condition of the issuer. Its analysis of issuers may include, among other things, current and anticipated cash flow and borrowing requirements, value of assets in relation to historical cost, strength of management, responsiveness to business conditions, credit standing and current anticipated results of operations. In selecting investments for the Fund, the Investment Adviser may also consider general business conditions, anticipated changes in interest rates and the outlook for specific industries. Subsequent to its purchase by the Fund, an issue of securities may cease to be rated or its rating may be reduced. In addition, it is possible that statistical rating agencies might change their ratings of a particular issue to reflect subsequent events on a timely basis. Moreover, such ratings do not assess the risk of a decline in market value. None of these events will require the sale of the securities by the Fund, although the Investment Adviser will consider these events in determining whether the Fund should continue to hold the securities. Fixed income securities, including non-investment grade securities and comparable unrated securities, frequently have call or buy-back features that permit their issuers to call or repurchase the securities from their holders, such as the Fund. If an issuer exercises these rights during periods of declining interest rates, the Fund may have to replace the security with a lower yielding security, thus resulting in a decreased return for the Fund. The market for non-investment grade and comparable unrated securities has experienced periods of significantly adverse price and liquidity several times, particularly at or around times of economic recession. Past market recessions have adversely affected the value of such securities and the ability of certain issuers of such securities to repay principal and pay interest thereon or to refinance such securities. The market for those securities may react in a similar fashion in the future. Other Derivative Instruments Leveraging. The use of leverage magnifies the impact of changes in net asset value, which means that, all else being equal, the use of leverage results in outperformance on the upside and underperformance on the downside. In addition, if the cost of leverage exceeds the return on the securities acquired with the proceeds of leverage, the use of leverage will diminish rather than enhance the return to the Fund. The use of leverage generally increases the volatility of returns to the Fund. Such volatility may increase the likelihood of the Fund having to sell investments in order to meet its obligations to make distributions on the preferred shares or principal or interest payments on debt securities, or to redeem preferred shares or repay debt, when it may be disadvantageous to do so. The Fund’s use of leverage may require it to sell portfolio investments at inopportune times in order to raise cash to redeem preferred shares or otherwise de-leverage so as to maintain required asset coverage amounts or comply with any mandatory redemption terms of any outstanding preferred shares. See “Risk Factors and Special Considerations—Special Risks to Holders of Common Shares—Leverage Risk.” In the event the Fund had both outstanding preferred shares and senior securities representing debt at the same time, the Fund’s obligations to pay dividends or distributions and, upon liquidation of the Fund, liquidation payments in respect of its preferred shares would be subordinate to the Fund’s obligations to make any principal and/or interest payments due and owing with respect to its outstanding senior debt securities. Accordingly, the Fund’s issuance of senior securities representing debt would have the effect of creating special risks for the Fund’s preferred shareholders that would not be present in a capital structure that did not include such securities. See “Risk Factors and Special Considerations—Special Risks Related to Preferred Securities.” Subject to the requirements of Rule 18f-4 under the 1940 Act (“Rule 18f-4”), the Fund may enter into derivative transactions including transactions that have economic leverage embedded in them. Rule 18f-4 defines “derivatives transactions” as (1) any swap, security-based swap, futures contract, forward contract, option, any combination of the foregoing, or any similar instrument, under which a fund is or may be required to make any payment or delivery of cash or other assets during the life of the instrument or at maturity or early termination, whether as margin or settlement payment or otherwise; and (2) any short sale borrowing. Derivatives transactions entered into by the Fund in compliance with Rule 18f-4 will not be considered senior securities for purposes of computing the asset coverage requirements described above. Economic leverage exists when the Fund achieves the right to a return on a capital base that exceeds the investment which the Fund has contributed to the instrument achieving a return. Derivative transactions that the Fund may enter into and the risks associated with them are described elsewhere in this Annual Report. The Fund cannot assure you that investments in derivative transactions that have economic leverage embedded in them will result in a higher return on its common shares. If the Fund enters into any reverse repurchase agreements or similar financing transactions obligating the Fund to make future payments, the Fund must either treat all such transactions as derivatives transactions for all purposes under Rule 18f-4 or otherwise comply with the asset coverage requirements described above and combine the aggregate amount of indebtedness associated with all such transactions with the aggregate amount of any other senior securities representing indebtedness when calculating the Fund’s asset coverage ratio limit requirements. The asset coverage requirements under section 18 of the 1940 Act and the limits and conditions imposed by Rule 18f-4 may limit or restrict portfolio management. Temporary Defensive Investments Portfolio Turnover Portfolio turnover generally involves some expense to the Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestment in other securities. The portfolio turnover rate is computed by dividing the lesser of the amount of the securities purchased or securities sold by the average monthly value of securities owned during the year (excluding securities whose maturities at acquisition were one year or less). Higher portfolio turnover may decrease the after-tax return to individual investors in the Fund to the extent it results in a decrease of the long-term capital gains portion of distributions to shareholders. Interest Rate Tra | ||||||||||||||||||
| Risk Factors [Table Text Block] | RISK FACTORS AND SPECIAL CONSIDERATIONS Investors should consider the following risk factors and special considerations associated with investing in the Fund: Market Risk The market price of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. Securities may decline in value due to factors affecting securities markets generally or particular industries represented in the securities markets. The value of a security may decline due to general market conditions which are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, adverse changes to credit markets or adverse investor sentiment generally. The value of a security may also decline due to factors which affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Equity securities generally have greater price volatility than fixed income securities. Credit ratings downgrades may also negatively affect securities held by the Fund. Even when markets perform well, there is no assurance that the investments held by the Fund will increase in value along with the broader market. In addition, market risk includes the risk that geopolitical and other events will disrupt the economy on a national or global level. For instance, war, terrorism, market manipulation, government defaults, government shutdowns, political changes or diplomatic developments, public health emergencies (such as the spread of infectious diseases, pandemics and epidemics) and natural/environmental disasters can all negatively impact the securities markets, which could cause the Fund to lose value. These events could reduce consumer demand or economic output, result in market closures, travel restrictions or quarantines, and significantly adversely impact the economy. The current contentious domestic political environment, as well as political and diplomatic events within the United States and abroad, such as the U.S. government’s inability at times to agree on a long-term budget and deficit reduction plan, has in the past resulted, and may in the future result, in a government shutdown, which could have an adverse impact on the Fund’s investments and operations. Additional and/or prolonged U.S. federal government shutdowns may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Governmental and quasi-governmental authorities and regulators throughout the world have previously responded to serious economic disruptions with a variety of significant fiscal and monetary policy changes, including, but not limited to, direct capital infusions into companies, new monetary programs and dramatically lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of these policies, could increase volatility in securities markets, which could adversely affect the Fund’s investments. Any market disruptions could also prevent the Fund from executing advantageous investment decisions in a timely manner. To the extent that the Fund focuses its investments in a region enduring geopolitical market disruption, it will face higher risks of loss, although the increasing interconnectivity between global economies and financial markets can lead to events or conditions in one country, region or financial market adversely impacting a different country, region or financial market. Thus, investors should closely monitor current market conditions to determine whether the Fund meets their individual financial needs and tolerance for risk. Current market conditions may pose heightened risks with respect to the Fund’s investment in fixed income securities. Central banks such as the Federal Reserve Bank have been increasing interest rates, though this trend has tempered recently as the rate of inflation slows. There is a risk that additional increases in interest rates or a prolonged period of rising interest rates may cause the economy to enter a recession. Additional interest rate increases in the future could cause the value of the Fund to decrease. Recently, inflation levels have been at their highest point in nearly 40 years and the Federal Reserve has been engaged in a campaign to raise certain benchmark interest rates in an effort to combat inflation. As inflation increases, the real value of the Fund’s common stock and distributions therefore may decline. Exchanges and securities markets may close early, close late or issue trading halts on specific securities or generally, which may result in, among other things, the Fund being unable to buy or sell certain securities or financial instruments at an advantageous time or accurately price its portfolio investments. Interest Rate Risk Generally. General interest rate fluctuations may have a substantial negative impact on the Fund’s investments, the value of the Fund and the Fund’s rate of return. A reduction in the interest or dividend rates on new investments relative to interest or dividend rates on current investments could also have an adverse impact on the Fund’s net investment income. An increase in interest rates could decrease the value of any investments held by the Fund that earn fixed interest or dividend rates, including debt securities, convertible securities, preferred stocks, loans and high-yield bonds, and also could increase interest or dividend expenses, thereby decreasing net income. The magnitude of these fluctuations in the market price of bonds and other income- or dividend-paying securities is generally greater for those securities with longer maturities. Fluctuations in the market price of the Fund’s investments will not affect interest income derived from instruments already owned by the Fund, but will be reflected in the Fund’s net asset value. The Fund may lose money if short-term or long-term interest rates rise sharply in a manner not anticipated by Fund management. To the extent the Fund invests in securities that may be prepaid at the option of the obligor, the sensitivity of such securities to changes in interest rates may increase (to the detriment of the Fund) when interest rates rise. Moreover, because rates on certain floating rate securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate securities. These basic principles of bond prices also apply to U.S. government securities. A security backed by the “full faith and credit” of the U.S. government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price. Just like other income- or dividend-paying securities, government-guaranteed securities will fluctuate in value when interest rates change. The Fund’s use of leverage will tend to increase the Fund’s interest rate risk. The Fund may invest in variable and floating rate instruments, which generally are less sensitive to interest rate changes than longer duration fixed rate instruments but may decline in value in response to rising interest rates if, for example, the rates at which they pay interest do not rise as much, or as quickly, as market interest rates in general. Conversely, variable and floating rate instruments generally will not increase in value if interest rates decline. The Fund also may invest in inverse floating rate securities, which may decrease in value if interest rates increase, and which also may exhibit greater price volatility than fixed rate obligations with similar credit quality. To the extent the Fund holds variable or floating rate instruments, a decrease (or, in the case of inverse floating rate securities, an increase) in market interest rates will adversely affect the income received from such securities, which may adversely affect the net asset value of the Fund’s common shares. Central banks such as the Federal Reserve Bank have been increasing interest rates, though this trend has tempered recently as the rate of inflation slows. There is a risk that heightened interest rates may cause the economy to enter a recession. Any such recession would negatively impact the Fund and the investments held by the Fund. These impacts may include: ● severe declines in the Fund’s net asset values; ● inability of the Fund to accurately or reliably value its portfolio; ● inability of the Fund to pay any dividends or distributions; ● inability of the Fund to maintain its status as a registered investment company (“RIC”) under the Internal Revenue Code of 1986, as amended (the “Code”); ● declines in the value of the Fund’s investments; ● increased risk of default or bankruptcy by the companies in which the Fund invests; ● increased risk of companies in which the Fund invests being unable to weather an extended cessation of normal economic activity and thereby impairing their ability to continue functioning as a going concern; and ● limited availability of new investment opportunities. Inflation Risk. Total Return Risk The Fund utilizes several investment management techniques in an effort to generate positive total return. The risks of these techniques, such as option writing, leverage, concentration in certain industries, and investing in emerging markets, are described in the following paragraphs. Taken together these and other techniques represent a risk that the Fund will experience a negative total return even in market environments that are generally positive and that the Fund’s returns, both positive and negative, may be more volatile than if the Fund did not utilize these investment techniques. Industry Risks Industry Risks. The Fund’s investments will be concentrated in the gold and natural resources industries. Because the Fund is concentrated in these industries, it may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in the gold or natural resources industries would have a larger impact on the Fund than on an investment company that does not concentrate in such industries. The Fund invests in equity securities of Gold Companies. The Fund invests in equity securities of Natural Resources Companies. performance of securities of Natural Resources Companies may lag the performance of other industries or the broader market as a whole. Supply and Demand Risk Sustained declines in demand for the indicated commodities could also adversely affect the financial performance of Gold Companies and Natural Resources Companies over the long-term. Factors which could lead to a decline in demand include economic recession or other adverse economic conditions, higher fuel taxes or governmental regulations, increases in fuel economy, consumer shifts to the use of alternative fuel sources, changes in commodity prices, or weather. Depletion and Exploration Risk Regulatory Risk Commodity Pricing Risk Volatility of commodity prices, which may lead to a reduction in production or supply, may also negatively affect the performance of Gold Companies and Natural Resources Companies which are solely involved in the transportation, processing, storing, distribution or marketing of commodities. Volatility of commodity prices may also make it more difficult for Gold Companies and Natural Resources Companies to raise capital to the extent the market perceives that their performance may be directly or indirectly tied to commodity prices. Oil and Natural Gas Price Volatility Risk. A combination of factors, including a substantial decline in global demand for crude oil caused by a pandemic and subsequent mitigation efforts, as well as market concerns about the ability of OPEC+ to agree on a perceived need to implement production cuts in response to weaker worldwide demand, caused an unprecedented decline in crude oil and natural gas prices during the first six months of 2020. These and other developments may adversely impact the Fund and its performance. Cybersecurity and Physical Security Risks. Natural Resources Companies may continue to be subject to attempts to gain unauthorized access to or through their operating systems. Any system failure, cybersecurity breach, ransomware attack or other system disruption could interrupt or delay operations and impact a Natural Resources Company’s ability to manage its operations and report financial performance, which could have a materially adverse effect on existing and future business. These and other developments may adversely impact the value of the Fund’s investments in Natural Resources Companies. Climate Change Risk change regulation on the Fund’s investments are not material, but the Fund cannot predict the long-term impacts on the Fund or its investments from climate change or related regulations. The ongoing political focus on climate change has resulted in various treaties, laws and regulations which are intended to limit carbon emissions. The Fund believes these laws being enacted or proposed may cause energy costs at properties owned by the real estate investment trusts (“REITs”) or other real estate companies in which the Fund invests to increase. The Fund does not expect the direct impact of such increases to be material to the value of its investments, because the increased costs either would be the responsibility of tenants or operators of properties owned by the REITs or other real estate companies in which the Fund invests, or, in the longer-term, passed through and paid by the customers of such properties. There can be no assurance that climate change will not have a material adverse effect on the properties, operations or business of the Fund’s investments in REITs and other real estate companies. The physical effects of climate change could have a material adverse effect on the properties, operations and business of the Fund’s investments in REITs and other real estate companies in certain geographical locations. To the extent climate change causes changes in weather patterns, properties in these markets could experience increases in storm intensity, flooding and rising sea levels. Over time, these conditions could result in declining demand for the buildings owned by certain REITs and other real estate companies in which the Fund invests, or the inability of such REITs or other real estate companies to operate such buildings at all. Interest Rate Risk for Natural Resources Companies and Gold Companies. Risks Associated with Covered Calls and Other Option Transactions There are several risks associated with transactions in options on securities. For example, there are significant differences between the securities and options markets that could result in an imperfect correlation between these markets, causing a given covered call option transaction not to achieve its objectives. A decision as to whether, when and how to use covered calls (or other options) involves the exercise of skill and judgment, and any transaction may be unsuccessful because of market behavior or unexpected events. The use of options may require the Fund to sell portfolio securities at inopportune times or for prices other than current market values, may limit the amount of appreciation the Fund can realize on an investment, or may cause the Fund to hold a security it might otherwise sell. As the writer of a covered call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the exercise price of the call option, but has retained the risk of loss should the price of the underlying security decline. Although such loss would be offset in part by the option premium received, in a situation in which the price of a particular stock on which the Fund has written a covered call option declines rapidly and materially or in which prices in general on all or a substantial portion of the stocks on which the Fund has written covered call options decline rapidly and materially, the Fund could sustain material depreciation or loss in its net assets to the extent it does not sell the underlying securities (which may require it to terminate, offset or otherwise cover its option position as well). The writer of an option has no control over the time when it may be required to fulfill its obligation as a writer of the option. Once an option writer has received an exercise notice, it cannot effect a closing purchase transaction in order to terminate its obligation under the option and must deliver the underlying security at the exercise price. There can be no assurance that a liquid market will exist when the Fund seeks to close out an option position. Reasons for the absence of a liquid secondary market for exchange-traded options include the following: (i) there may be insufficient trading interest; (ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the trading facilities of an exchange or the Options Clearing Corporation (the “OCC”) may not be adequate to handle current trading volume; or (vi) the relevant exchange could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a particular class or series of options). If trading were discontinued, the secondary market on that exchange (or in that class or series of options) would cease to exist. However, outstanding options on that exchange that had been issued by the OCC as a result of trades on that exchange would continue to be exercisable in accordance with their terms. The Fund’s ability to terminate OTC options may be more limited than with exchange-traded options and may involve the risk that counterparties participating in such transactions will not fulfill their obligations. If the Fund were unable to close out a covered call option that it had written on a security, it would not be able to sell the underlying security unless the option expired without exercise. The hours of trading for options may not conform to the hours during which the underlying securities are traded. To the extent that the options markets close before the markets for the underlying securities, significant price and rate movements can take place in the underlying markets that cannot be reflected in the options markets. Call options are marked to market daily and their value will be affected by changes in the value of and dividend rates of the underlying common stocks, an increase in interest rates, changes in the actual or perceived volatility of the stock market and the underlying common stocks and the remaining time to the options’ expiration. Additionally, the exercise price of an option may be adjusted downward before the option’s expiration as a result of the occurrence of certain corporate events affecting the underlying equity security, such as extraordinary dividends, stock splits, merger or other extraordinary distributions or events. A reduction in the exercise price of an option would reduce the Fund’s capital appreciation potential on the underlying security. Limitation on Covered Call Writing Risk. Risks Associated with Uncovered Calls There are special risks associated with uncovered option writing which expose the Fund to potentially significant loss. As the writer of an uncovered call option, the Fund has no risk of loss should the price of the underlying security decline, but bears unlimited risk of loss should the price of the underlying security increase above the exercise price until the Fund covers its exposure. As with writing uncovered calls, the risk of writing uncovered put options is substantial. The writer of an uncovered put option bears a risk of loss if the value of the underlying instrument declines below the exercise price. Such loss could be substantial if there is a significant decline in the value of the underlying instrument. For combination writing, where the Fund writes both a put and a call on the same underlying instrument, the potential risk is unlimited. If a secondary market in options were to become unavailable, the Fund could not engage in losing transactions and would remain obligated until expiration or assignment. Equity Risk Investing in the Fund involves equity risk, which is the risk that the securities held by the Fund will fall in market value due to adverse market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate and the particular circumstances and performance of particular companies whose securities the Fund holds. An investment in the Fund represents an indirect economic stake in the securities owned by the Fund, which are for the most part traded on securities exchanges or in the OTC markets. The market value of these securities, like other market investments, may move up or down, sometimes rapidly and unpredictably. The net asset value of the Fund may at any point in time be less than the net asset value of the Fund at the time the shareholder invested in the Fund, even after taking into account any reinvestment of distributions. Leverage Risk The Fund currently uses financial leverage for investment purposes by issuing preferred shares and is also permitted to use other types of financial leverage, such as through the issuance of debt securities or additional preferred shares and borrowing from financial institutions. As provided in the 1940 Act and subject to certain exceptions, the Fund may issue additional senior securities (which may be stock, such as preferred shares, and/or securities representing debt) only if immediately after such issuance the value of the Fund’s total assets, less certain ordinary course liabilities, exceeds 300% of the amount of the debt outstanding and exceeds 200% of the amount of preferred shares and debt outstanding. As of December 31, 2023, the amount of leverage represented approximately 12% of the Fund’s net assets. The Fund’s leveraged capital structure creates special risks not associated with unleveraged funds having a similar investment objective and policies. These include the possibility of greater loss and the likelihood of higher volatility of the net asset value of the Fund and the asset coverage for the preferred shares. Such volatility may increase the likelihood of the Fund having to sell investments in order to meet its obligations to make distributions on the preferred shares or principal or interest payments on debt securities, or to redeem preferred shares or repay debt, when it may be disadvantageous to do so. The Fund’s use of leverage may require it to sell portfolio investments at inopportune times in order to raise cash to redeem preferred shares or otherwise de-leverage so as to maintain required asset coverage amounts or comply with the mandatory redemption terms of any outstanding preferred shares. The use of leverage magnifies both the favorable and unfavorable effects of price movements in the investments made by the Fund. To the extent that the Fund employs leverage in its investment operations, the Fund is subject to substantial risk of loss. The Fund cannot assure you that borrowings or the issuance of preferred shares or notes will result in a higher yield or return to the holders of the common shares. Also, since the Fund utilizes leverage, a decline in net asset value could affect the ability of the Fund to make common share distributions and such a failure to make distributions could result in the Fund ceasing to qualify as a RIC under the Code. Any decline in the net asset value of the Fund’s investments would be borne entirely by the holders of common shares. Therefore, if the market value of the Fund’s portfolio declines, the leverage will result in a greater decrease in net asset value to the holders of common shares than if the Fund were not leveraged. This greater net asset value decrease will also tend to cause a greater decline in the market price for the common shares. The Fund might be in danger of failing to maintain the required asset coverage of its borrowings, notes or preferred shares or of losing its ratings on its notes or preferred shares or, in an extreme case, the Fund’s current investment income might not be sufficient to meet the distribution or interest requirements on its preferred shares, borrowings or notes. In order to counteract such an event, the Fund might need to liquidate investments in order to fund a redemption or repayment of some or all of the preferred shares, borrowings or notes. Preferred Share and Note Risk In addition, the Fund would pay (and the holders of common shares will bear) all costs and expenses relating to the issuance and ongoing maintenance of the preferred shares or notes, including the advisory fees on the incremental assets attributable to the preferred shares or notes. Holders of preferred shares and notes may have different interests than holders of common shares and may at times have disproportionate influence over the Fund’s affairs. As provided in the 1940 Act and subject to certain exceptions, the Fund may issue senior securities (which may be stock, such as preferred shares, and/or securities representing debt, such as notes) only if immediately after such issuance the value of the Fund’s total assets, less certain ordinary course liabilities, exceeds 300% of the amount of the debt outstanding (i.e., for every dollar of indebtedness outstanding, the Fund is required to have at least three dollars of assets) and exceeds 200% of the amount of preferred shares and debt outstanding (i.e., for every dollar in liquidation preference of preferred stock outstanding, the Fund is required to have two dollars of assets), which is referred to as the “asset coverage” required by the 1940 Act. In the event the Fund fails to maintain an asset coverage of 100% for any notes outstanding for certain periods of time, the 1940 Act requires that either an event of default be declared or that the holders of such notes have the right to elect a majority of the Fund’s Trustees until asset coverage recovers to 110%. In addition, holders of preferred shares, voting separately as a single class, have the right (subject to the rights of noteholders) to elect two members of the Board at all times and in the event dividends become two full years in arrears would have the right to elect a majority of the Trustees until such arrearage is completely eliminated. In addition, preferred shareholders have class voting rights on certain matters, including changes in fundamental investment restrictions and conversion of the Fund to open-end status, and accordingly can veto any such changes. Further, interest on notes would be payable when due and if the Fund does not pay interest when due, it will trigger an event of default and the Fund expects to be restricted from declaring dividends and making other distributions with respect to common shares and preferred shares. Upon the occurrence and continuance of an event of default, the holders of a majority in principal amount of a series of outstanding notes or the Trustee will be able to declare the principal amount of that series of notes immediately due and payable upon written notice to the Fund. The 1940 Act also generally restricts the Fund from declaring distributions on, or repurchasing, common or preferred shares unless notes have an asset coverage of 300% (200% in the case of declaring distributions on preferred shares). The Fund’s common shares are structurally subordinated as to income and residual value to any preferred shares or notes in the Fund’s capital structure, in terms of priority to income and payment in liquidation. Restrictions imposed on the declarations and payment of dividends or other distributions to the holders of the Fund’s common shares and preferred shares, both by the 1940 Act and by requirements imposed by rating agencies, might impair the Fund’s ability to maintain its qualification as a RIC for U.S. federal income tax purposes. While the Fund intends to redeem its preferred shares or notes to the extent necessary to enable the Fund to distribute its income as required to maintain its qualification as a RIC under the Code, there can be no assurance that such actions can be effected in time to meet the Code requirements. Portfolio Guidelines of Rating Agencies for Preferred Shares and/or Credit Facility Impact on Common Shares table is furnished in response to requirements of the SEC. It is designed to illustrate the effect of leverage on common share total return, assuming investment portfolio total returns (comprised of net investment income of the Fund, realized gains or losses of the Fund and changes in the value of the securities held in the Fund’s portfolio) of -10%, -5%, 0%, 5% and 10%. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. The table further reflects leverage representing 12% of the Fund’s net assets (the Fund’s amount of outstanding financial leverage at December 31, 2023), the Fund’s current projected blended annual average leverage dividend or interest rate of 5.00% (the average dividend rate on the Fund’s outstanding financial leverage at December 31, 2023), a base management fee at an annual rate of 1.00% of the liquidation preference of any outstanding preferred shares and estimated annual incremental expenses attributable to any outstanding preferred shares of 0.01% of the Fund’s net assets attributable to common shares. Assumed Return on Portfolio (Net of Expenses) (10 )% (5 )% 0 % 5 % 10 % Corresponding Return to Common Shareholder (12.18 )% (6.50 )% (0.82 )% 4.86 % 10.54 % Common share total return is composed of two elements—the common share distributions paid by the Fund (the amount of which is largely determined by the taxable income of the Fund (including realized gains or losses) after paying interest on any debt and/or dividends on any preferred shares) and unrealized gains or losses on the value of the securities the Fund owns. As required by SEC rules, the table assumes that the Fund is more likely to suffer capital losses than to enjoy total return. For example, to assume a total return of 0% the Fund must assume that the income it receives on its investments is entirely offset by expenses and losses in the value of those investments. Market Discount Risk. Foreign Securities Risk Because many of the world’s Gold Companies and Natural Resources Companies are located outside of the United States, the Fund may have a significant portion of its investments in securities that are traded in foreign markets and that are not subject to the requirements of the U.S. securities laws, markets and accounting requirements. Investments in the securities of foreign issuers involve certain considerations and risks not ordinarily associated with investments in securities of domestic issuers and such securities may be more volatile than those of issuers located in the United States. Foreign companies are not generally subject to uniform accounting, auditing and financial standards and requirements comparable to those applicable to U.S. companies. The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries, and there may be greater levels of price volatility in foreign markets. Foreign securities exchanges, brokers and listed companies may be subject to less government supervision and regulation than exists in the United States. Dividend and interest income may be subject to withholding and other foreign taxes, which may adversely affect the net return on such investments. There may be difficulty in obtaining or enforcing a court judgment abroad. In addition, it may be difficult to effect repatriation of capital invest | ||||||||||||||||||
| Effects of Leverage [Text Block] | Impact on Common Shares table is furnished in response to requirements of the SEC. It is designed to illustrate the effect of leverage on common share total return, assuming investment portfolio total returns (comprised of net investment income of the Fund, realized gains or losses of the Fund and changes in the value of the securities held in the Fund’s portfolio) of -10%, -5%, 0%, 5% and 10%. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. The table further reflects leverage representing 12% of the Fund’s net assets (the Fund’s amount of outstanding financial leverage at December 31, 2023), the Fund’s current projected blended annual average leverage dividend or interest rate of 5.00% (the average dividend rate on the Fund’s outstanding financial leverage at December 31, 2023), a base management fee at an annual rate of 1.00% of the liquidation preference of any outstanding preferred shares and estimated annual incremental expenses attributable to any outstanding preferred shares of 0.01% of the Fund’s net assets attributable to common shares. Assumed Return on Portfolio (Net of Expenses) (10 )% (5 )% 0 % 5 % 10 % Corresponding Return to Common Shareholder (12.18 )% (6.50 )% (0.82 )% 4.86 % 10.54 % Common share total return is composed of two elements—the common share distributions paid by the Fund (the amount of which is largely determined by the taxable income of the Fund (including realized gains or losses) after paying interest on any debt and/or dividends on any preferred shares) and unrealized gains or losses on the value of the securities the Fund owns. As required by SEC rules, the table assumes that the Fund is more likely to suffer capital losses than to enjoy total return. For example, to assume a total return of 0% the Fund must assume that the income it receives on its investments is entirely offset by expenses and losses in the value of those investments. Market Discount Risk. | ||||||||||||||||||
| Share Price [Table Text Block] | The following table sets forth for the quarters indicated, the high and low sale prices on the NYSE American per share of our common shares and the net asset value and the premium or discount from net asset value per share at which the common shares were trading, expressed as a percentage of net asset value, at each of the high and low sale prices provided. Common Share Corresponding Corresponding Quarter Ended High Low High Low High Low March 31, 2022 $4.07 $3.64 $4.24 $3.84 (4.01)% (5.21)% June 30, 2022 $4.12 $3.59 $4.35 $3.64 (5.29)% (1.37)% September 30, 2022 $3.66 $3.08 $3.67 $3.18 (0.27)% (3.14)% December 31, 2022 $3.63 $3.27 $3.87 $3.34 (6.20)% (2.10)% March 31, 2023 $3.85 $3.48 $4.09 $3.75 (5.87)% (7.20)% June 30, 2023 $3.85 $3.64 $3.94 $3.80 (2.28)% (4.21)% September 30, 2023 $3.84 $3.63 $4.06 $3.77 (5.42)% (3.71)% December 31, 2023 $3.78 $3.52 $4.01 $3.61 (5.74)% (2.49)% | ||||||||||||||||||
| NAV Per Share | $ 3.76 | $ 3.76 | $ 3.76 | ||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||
| Capital Stock [Table Text Block] | 6. Capital. The Board has authorized the repurchase of its common shares in the open market when the shares are trading at a discount of 7.5% or more (or such other percentage as the Board may determine from time to time) from the NAV of the shares. During the years ended December 31, 2023 and 2022, the Fund did not repurchase any common shares. The Fund did not have any transactions in common shares of beneficial interest for the years ended December 31, 2023 and 2022. The Fund’s Declaration of Trust, as amended, authorizes the issuance of an unlimited number of $0.001 par value Preferred Shares. The Series B Preferred are callable at any time at the liquidation value of $25 per share plus accrued and unpaid dividends. The Board has authorized the repurchase of the Series B Preferred in the open market at prices less than the $25 liquidation value per share. During the years ended December 31, 2023 and 2022 the Fund repurchased and retired 76,939 and 43,476 of Series B Preferred at investments of $1,683,202 and $969,992 and at discounts of approximately 12.53% and 10.80% to its liquidation preference. At December 31, 2023, 3,339,484 Series B Preferred were outstanding and accrued dividends amounted to $57,977. The Series B Preferred is senior to the common shares and results in the financial leveraging of the common shares. Such leveraging tends to magnify both the risks and opportunities to common shareholders. Dividends on the Series B Preferred are cumulative. The Fund is required by the 1940 Act and by the Statement of Preferences to meet certain asset coverage tests with respect to the Series B Preferred. If the Fund fails to meet these requirements and does not correct such failure, the Fund may be required to redeem, in part or in full, the Series B Preferred at the redemption price of $25 per share plus an amount equal to the accumulated and unpaid dividends whether or not declared on such shares in order to meet the requirements. Additionally, failure to meet the foregoing asset coverage requirements could restrict the Fund’s ability to pay dividends to common shareholders and could lead to sales of portfolio securities at inopportune times. The income received on the Fund’s assets may vary in a manner unrelated to the fixed rate, which could have either a beneficial or detrimental impact on net investment income and gains available to common shareholders. The holders of Preferred Shares generally are entitled to one vote per share held on each matter submitted to a vote of shareholders of the Fund and will vote together with holders of common shares as a single class. The holders of Preferred Shares voting together as a single class also have the right currently to elect two Trustees and, under certain circumstances, are entitled to elect a majority of the Board of Trustees. In addition, the affirmative vote of a majority of the votes entitled to be cast by holders of all outstanding shares of the Preferred Shares, voting as a single class, will be required to approve any plan of reorganization adversely. | ||||||||||||||||||
| Outstanding Securities [Table Text Block] | Outstanding Securities The following information regarding the Fund’s outstanding securities is as of December 31, 2023. Title of Class Amount Amount Held by Amount Outstanding Exclusive of Common Shares Unlimited – 154,158,319 5.00% Series B Cumulative Preferred Shares Unlimited – 3,339,484 | ||||||||||||||||||
| Document Period End Date | Dec. 31, 2023 | ||||||||||||||||||
| Common Stocks [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Return at Minus Ten [Percent] | (12.18%) | ||||||||||||||||||
| Return at Minus Five [Percent] | (6.50%) | ||||||||||||||||||
| Return at Zero [Percent] | (0.82%) | ||||||||||||||||||
| Return at Plus Five [Percent] | 4.86% | ||||||||||||||||||
| Return at Plus Ten [Percent] | 10.54% | ||||||||||||||||||
| Lowest Price or Bid | 3.52 | $ 3.63 | $ 3.64 | $ 3.48 | $ 3.27 | $ 3.08 | $ 3.59 | $ 3.64 | |||||||||||
| Highest Price or Bid | 3.78 | 3.84 | 3.85 | 3.85 | 3.63 | 3.66 | 4.12 | 4.07 | |||||||||||
| Lowest Price or Bid, NAV | 3.61 | 3.77 | 3.80 | 3.75 | 3.34 | 3.18 | 3.64 | 3.84 | |||||||||||
| Highest Price or Bid, NAV | $ 4.01 | $ 4.06 | $ 3.94 | $ 4.09 | $ 3.87 | $ 3.67 | $ 4.35 | $ 4.24 | |||||||||||
| Highest Price or Bid, Premium (Discount) to NAV [Percent] | (5.74%) | (5.42%) | (2.28%) | (5.87%) | (6.20%) | (0.27%) | (5.29%) | (4.01%) | |||||||||||
| Lowest Price or Bid, Premium (Discount) to NAV [Percent] | (2.49%) | (3.71%) | (4.21%) | (7.20%) | (2.10%) | (3.14%) | (1.37%) | (5.21%) | |||||||||||
| NAV Per Share | $ 3.97 | $ 3.97 | $ 3.97 | ||||||||||||||||
| Latest Premium (Discount) to NAV [Percent] | (5.29%) | ||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||
| Outstanding Security, Title [Text Block] | Common Shares | ||||||||||||||||||
| Outstanding Security, Held [Shares] | 0 | ||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 154,158,319 | ||||||||||||||||||
| Common Shares [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| NAV Per Share | $ 3.97 | $ 3.97 | $ 3.97 | ||||||||||||||||
| Series B Cumulative Preferred Stock [Member] | |||||||||||||||||||
| Financial Highlights [Abstract] | |||||||||||||||||||
| Senior Securities Amount | $ 83,487,000 | $ 83,487,000 | $ 85,411,000 | $ 83,487,000 | $ 85,411,000 | $ 86,497,000 | $ 86,497,000 | $ 86,646,000 | $ 87,112 | $ 87,909 | $ 88,767 | $ 89,724 | $ 92,512 | ||||||
| Senior Securities Coverage per Unit | $ 208 | $ 208 | $ 200 | $ 208 | $ 200 | $ 199 | $ 206 | $ 219 | $ 188 | $ 236 | $ 240 | $ 193 | $ 249 | ||||||
| Preferred Stock Liquidating Preference | $ 25 | $ 25 | $ 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | ||||||
| Senior Securities Average Market Value per Unit | $ 22.25 | $ 23.43 | $ 25.45 | $ 25.13 | $ 24.12 | $ 23.06 | $ 24.13 | $ 23.81 | $ 22.03 | $ 21.28 | |||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 3,339,000 | 3,416,000 | 3,460,000 | 3,460,000 | 3,466,000 | 3,484,000 | 3,516,000 | 3,551,000 | 3,589,000 | 3,700,000 | |||||||||
| Cumulative Preferred Stocks [Member] | |||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||
| Security Voting Rights [Text Block] | The holders of Preferred Shares generally are entitled to one vote per share held on each matter submitted to a vote of shareholders of the Fund and will vote together with holders of common shares as a single class. The holders of Preferred Shares voting together as a single class also have the right currently to elect two Trustees and, under certain circumstances, are entitled to elect a majority of the Board of Trustees. In addition, the affirmative vote of a majority of the votes entitled to be cast by holders of all outstanding shares of the Preferred Shares, voting as a single class, will be required to approve any plan of reorganization adversely. | ||||||||||||||||||
| Preferred Stock Restrictions, Other [Text Block] | The Fund’s Declaration of Trust, as amended, authorizes the issuance of an unlimited number of $0.001 par value Preferred Shares. The Series B Preferred are callable at any time at the liquidation value of $25 per share plus accrued and unpaid dividends. The Board has authorized the repurchase of the Series B Preferred in the open market at prices less than the $25 liquidation value per share. During the years ended December 31, 2023 and 2022 the Fund repurchased and retired 76,939 and 43,476 of Series B Preferred at investments of $1,683,202 and $969,992 and at discounts of approximately 12.53% and 10.80% to its liquidation preference. At December 31, 2023, 3,339,484 Series B Preferred were outstanding and accrued dividends amounted to $57,977. The Series B Preferred is senior to the common shares and results in the financial leveraging of the common shares. Such leveraging tends to magnify both the risks and opportunities to common shareholders. Dividends on the Series B Preferred are cumulative. The Fund is required by the 1940 Act and by the Statement of Preferences to meet certain asset coverage tests with respect to the Series B Preferred. If the Fund fails to meet these requirements and does not correct such failure, the Fund may be required to redeem, in part or in full, the Series B Preferred at the redemption price of $25 per share plus an amount equal to the accumulated and unpaid dividends whether or not declared on such shares in order to meet the requirements. Additionally, failure to meet the foregoing asset coverage requirements could restrict the Fund’s ability to pay dividends to common shareholders and could lead to sales of portfolio securities at inopportune times. The income received on the Fund’s assets may vary in a manner unrelated to the fixed rate, which could have either a beneficial or detrimental impact on net investment income and gains available to common shareholders. | ||||||||||||||||||
| Dividends On Preferred Shares Not Included [Member] | |||||||||||||||||||
| Other Annual Expenses [Abstract] | |||||||||||||||||||
| Expense Example, Year 01 | $ 14 | ||||||||||||||||||
| Expense Example, Years 1 to 3 | 44 | ||||||||||||||||||
| Expense Example, Years 1 to 5 | 76 | ||||||||||||||||||
| Expense Example, Years 1 to 10 | $ 167 | ||||||||||||||||||
| Five Percent Series B Cumulative Preferred Stock [Member] | |||||||||||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |||||||||||||||||||
| Outstanding Security, Title [Text Block] | 5.00% Series B Cumulative Preferred Shares | ||||||||||||||||||
| Outstanding Security, Held [Shares] | 0 | ||||||||||||||||||
| Outstanding Security, Not Held [Shares] | 3,339,484 | ||||||||||||||||||
| Market Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Market Risk The market price of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. Securities may decline in value due to factors affecting securities markets generally or particular industries represented in the securities markets. The value of a security may decline due to general market conditions which are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, adverse changes to credit markets or adverse investor sentiment generally. The value of a security may also decline due to factors which affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Equity securities generally have greater price volatility than fixed income securities. Credit ratings downgrades may also negatively affect securities held by the Fund. Even when markets perform well, there is no assurance that the investments held by the Fund will increase in value along with the broader market. In addition, market risk includes the risk that geopolitical and other events will disrupt the economy on a national or global level. For instance, war, terrorism, market manipulation, government defaults, government shutdowns, political changes or diplomatic developments, public health emergencies (such as the spread of infectious diseases, pandemics and epidemics) and natural/environmental disasters can all negatively impact the securities markets, which could cause the Fund to lose value. These events could reduce consumer demand or economic output, result in market closures, travel restrictions or quarantines, and significantly adversely impact the economy. The current contentious domestic political environment, as well as political and diplomatic events within the United States and abroad, such as the U.S. government’s inability at times to agree on a long-term budget and deficit reduction plan, has in the past resulted, and may in the future result, in a government shutdown, which could have an adverse impact on the Fund’s investments and operations. Additional and/or prolonged U.S. federal government shutdowns may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Governmental and quasi-governmental authorities and regulators throughout the world have previously responded to serious economic disruptions with a variety of significant fiscal and monetary policy changes, including, but not limited to, direct capital infusions into companies, new monetary programs and dramatically lower interest rates. An unexpected or sudden reversal of these policies, or the ineffectiveness of these policies, could increase volatility in securities markets, which could adversely affect the Fund’s investments. Any market disruptions could also prevent the Fund from executing advantageous investment decisions in a timely manner. To the extent that the Fund focuses its investments in a region enduring geopolitical market disruption, it will face higher risks of loss, although the increasing interconnectivity between global economies and financial markets can lead to events or conditions in one country, region or financial market adversely impacting a different country, region or financial market. Thus, investors should closely monitor current market conditions to determine whether the Fund meets their individual financial needs and tolerance for risk. Current market conditions may pose heightened risks with respect to the Fund’s investment in fixed income securities. Central banks such as the Federal Reserve Bank have been increasing interest rates, though this trend has tempered recently as the rate of inflation slows. There is a risk that additional increases in interest rates or a prolonged period of rising interest rates may cause the economy to enter a recession. Additional interest rate increases in the future could cause the value of the Fund to decrease. Recently, inflation levels have been at their highest point in nearly 40 years and the Federal Reserve has been engaged in a campaign to raise certain benchmark interest rates in an effort to combat inflation. As inflation increases, the real value of the Fund’s common stock and distributions therefore may decline. Exchanges and securities markets may close early, close late or issue trading halts on specific securities or generally, which may result in, among other things, the Fund being unable to buy or sell certain securities or financial instruments at an advantageous time or accurately price its portfolio investments. | ||||||||||||||||||
| Interest Rate Risk Generally [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Interest Rate Risk Generally. General interest rate fluctuations may have a substantial negative impact on the Fund’s investments, the value of the Fund and the Fund’s rate of return. A reduction in the interest or dividend rates on new investments relative to interest or dividend rates on current investments could also have an adverse impact on the Fund’s net investment income. An increase in interest rates could decrease the value of any investments held by the Fund that earn fixed interest or dividend rates, including debt securities, convertible securities, preferred stocks, loans and high-yield bonds, and also could increase interest or dividend expenses, thereby decreasing net income. The magnitude of these fluctuations in the market price of bonds and other income- or dividend-paying securities is generally greater for those securities with longer maturities. Fluctuations in the market price of the Fund’s investments will not affect interest income derived from instruments already owned by the Fund, but will be reflected in the Fund’s net asset value. The Fund may lose money if short-term or long-term interest rates rise sharply in a manner not anticipated by Fund management. To the extent the Fund invests in securities that may be prepaid at the option of the obligor, the sensitivity of such securities to changes in interest rates may increase (to the detriment of the Fund) when interest rates rise. Moreover, because rates on certain floating rate securities typically reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause some fluctuations in the net asset value of the Fund to the extent that it invests in floating rate securities. These basic principles of bond prices also apply to U.S. government securities. A security backed by the “full faith and credit” of the U.S. government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price. Just like other income- or dividend-paying securities, government-guaranteed securities will fluctuate in value when interest rates change. The Fund’s use of leverage will tend to increase the Fund’s interest rate risk. The Fund may invest in variable and floating rate instruments, which generally are less sensitive to interest rate changes than longer duration fixed rate instruments but may decline in value in response to rising interest rates if, for example, the rates at which they pay interest do not rise as much, or as quickly, as market interest rates in general. Conversely, variable and floating rate instruments generally will not increase in value if interest rates decline. The Fund also may invest in inverse floating rate securities, which may decrease in value if interest rates increase, and which also may exhibit greater price volatility than fixed rate obligations with similar credit quality. To the extent the Fund holds variable or floating rate instruments, a decrease (or, in the case of inverse floating rate securities, an increase) in market interest rates will adversely affect the income received from such securities, which may adversely affect the net asset value of the Fund’s common shares. Central banks such as the Federal Reserve Bank have been increasing interest rates, though this trend has tempered recently as the rate of inflation slows. There is a risk that heightened interest rates may cause the economy to enter a recession. Any such recession would negatively impact the Fund and the investments held by the Fund. These impacts may include: ● severe declines in the Fund’s net asset values; ● inability of the Fund to accurately or reliably value its portfolio; ● inability of the Fund to pay any dividends or distributions; ● inability of the Fund to maintain its status as a registered investment company (“RIC”) under the Internal Revenue Code of 1986, as amended (the “Code”); ● declines in the value of the Fund’s investments; ● increased risk of default or bankruptcy by the companies in which the Fund invests; ● increased risk of companies in which the Fund invests being unable to weather an extended cessation of normal economic activity and thereby impairing their ability to continue functioning as a going concern; and ● limited availability of new investment opportunities. | ||||||||||||||||||
| Inflation Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Inflation Risk. | ||||||||||||||||||
| Total Return Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Total Return Risk The Fund utilizes several investment management techniques in an effort to generate positive total return. The risks of these techniques, such as option writing, leverage, concentration in certain industries, and investing in emerging markets, are described in the following paragraphs. Taken together these and other techniques represent a risk that the Fund will experience a negative total return even in market environments that are generally positive and that the Fund’s returns, both positive and negative, may be more volatile than if the Fund did not utilize these investment techniques. | ||||||||||||||||||
| Industry Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Industry Risks Industry Risks. The Fund’s investments will be concentrated in the gold and natural resources industries. Because the Fund is concentrated in these industries, it may present more risks than if it were broadly diversified over numerous industries and sectors of the economy. A downturn in the gold or natural resources industries would have a larger impact on the Fund than on an investment company that does not concentrate in such industries. The Fund invests in equity securities of Gold Companies. The Fund invests in equity securities of Natural Resources Companies. performance of securities of Natural Resources Companies may lag the performance of other industries or the broader market as a whole. Supply and Demand Risk Sustained declines in demand for the indicated commodities could also adversely affect the financial performance of Gold Companies and Natural Resources Companies over the long-term. Factors which could lead to a decline in demand include economic recession or other adverse economic conditions, higher fuel taxes or governmental regulations, increases in fuel economy, consumer shifts to the use of alternative fuel sources, changes in commodity prices, or weather. Depletion and Exploration Risk Regulatory Risk Commodity Pricing Risk Volatility of commodity prices, which may lead to a reduction in production or supply, may also negatively affect the performance of Gold Companies and Natural Resources Companies which are solely involved in the transportation, processing, storing, distribution or marketing of commodities. Volatility of commodity prices may also make it more difficult for Gold Companies and Natural Resources Companies to raise capital to the extent the market perceives that their performance may be directly or indirectly tied to commodity prices. Oil and Natural Gas Price Volatility Risk. A combination of factors, including a substantial decline in global demand for crude oil caused by a pandemic and subsequent mitigation efforts, as well as market concerns about the ability of OPEC+ to agree on a perceived need to implement production cuts in response to weaker worldwide demand, caused an unprecedented decline in crude oil and natural gas prices during the first six months of 2020. These and other developments may adversely impact the Fund and its performance. Cybersecurity and Physical Security Risks. Natural Resources Companies may continue to be subject to attempts to gain unauthorized access to or through their operating systems. Any system failure, cybersecurity breach, ransomware attack or other system disruption could interrupt or delay operations and impact a Natural Resources Company’s ability to manage its operations and report financial performance, which could have a materially adverse effect on existing and future business. These and other developments may adversely impact the value of the Fund’s investments in Natural Resources Companies. Climate Change Risk change regulation on the Fund’s investments are not material, but the Fund cannot predict the long-term impacts on the Fund or its investments from climate change or related regulations. The ongoing political focus on climate change has resulted in various treaties, laws and regulations which are intended to limit carbon emissions. The Fund believes these laws being enacted or proposed may cause energy costs at properties owned by the real estate investment trusts (“REITs”) or other real estate companies in which the Fund invests to increase. The Fund does not expect the direct impact of such increases to be material to the value of its investments, because the increased costs either would be the responsibility of tenants or operators of properties owned by the REITs or other real estate companies in which the Fund invests, or, in the longer-term, passed through and paid by the customers of such properties. There can be no assurance that climate change will not have a material adverse effect on the properties, operations or business of the Fund’s investments in REITs and other real estate companies. The physical effects of climate change could have a material adverse effect on the properties, operations and business of the Fund’s investments in REITs and other real estate companies in certain geographical locations. To the extent climate change causes changes in weather patterns, properties in these markets could experience increases in storm intensity, flooding and rising sea levels. Over time, these conditions could result in declining demand for the buildings owned by certain REITs and other real estate companies in which the Fund invests, or the inability of such REITs or other real estate companies to operate such buildings at all. Interest Rate Risk for Natural Resources Companies and Gold Companies. | ||||||||||||||||||
| Risks Associated With Covered Calls And Other Option Transactions [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Risks Associated with Covered Calls and Other Option Transactions There are several risks associated with transactions in options on securities. For example, there are significant differences between the securities and options markets that could result in an imperfect correlation between these markets, causing a given covered call option transaction not to achieve its objectives. A decision as to whether, when and how to use covered calls (or other options) involves the exercise of skill and judgment, and any transaction may be unsuccessful because of market behavior or unexpected events. The use of options may require the Fund to sell portfolio securities at inopportune times or for prices other than current market values, may limit the amount of appreciation the Fund can realize on an investment, or may cause the Fund to hold a security it might otherwise sell. As the writer of a covered call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the exercise price of the call option, but has retained the risk of loss should the price of the underlying security decline. Although such loss would be offset in part by the option premium received, in a situation in which the price of a particular stock on which the Fund has written a covered call option declines rapidly and materially or in which prices in general on all or a substantial portion of the stocks on which the Fund has written covered call options decline rapidly and materially, the Fund could sustain material depreciation or loss in its net assets to the extent it does not sell the underlying securities (which may require it to terminate, offset or otherwise cover its option position as well). The writer of an option has no control over the time when it may be required to fulfill its obligation as a writer of the option. Once an option writer has received an exercise notice, it cannot effect a closing purchase transaction in order to terminate its obligation under the option and must deliver the underlying security at the exercise price. There can be no assurance that a liquid market will exist when the Fund seeks to close out an option position. Reasons for the absence of a liquid secondary market for exchange-traded options include the following: (i) there may be insufficient trading interest; (ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the trading facilities of an exchange or the Options Clearing Corporation (the “OCC”) may not be adequate to handle current trading volume; or (vi) the relevant exchange could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a particular class or series of options). If trading were discontinued, the secondary market on that exchange (or in that class or series of options) would cease to exist. However, outstanding options on that exchange that had been issued by the OCC as a result of trades on that exchange would continue to be exercisable in accordance with their terms. The Fund’s ability to terminate OTC options may be more limited than with exchange-traded options and may involve the risk that counterparties participating in such transactions will not fulfill their obligations. If the Fund were unable to close out a covered call option that it had written on a security, it would not be able to sell the underlying security unless the option expired without exercise. The hours of trading for options may not conform to the hours during which the underlying securities are traded. To the extent that the options markets close before the markets for the underlying securities, significant price and rate movements can take place in the underlying markets that cannot be reflected in the options markets. Call options are marked to market daily and their value will be affected by changes in the value of and dividend rates of the underlying common stocks, an increase in interest rates, changes in the actual or perceived volatility of the stock market and the underlying common stocks and the remaining time to the options’ expiration. Additionally, the exercise price of an option may be adjusted downward before the option’s expiration as a result of the occurrence of certain corporate events affecting the underlying equity security, such as extraordinary dividends, stock splits, merger or other extraordinary distributions or events. A reduction in the exercise price of an option would reduce the Fund’s capital appreciation potential on the underlying security. Limitation on Covered Call Writing Risk. | ||||||||||||||||||
| Risks Associated With Uncovered Calls [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Risks Associated with Uncovered Calls There are special risks associated with uncovered option writing which expose the Fund to potentially significant loss. As the writer of an uncovered call option, the Fund has no risk of loss should the price of the underlying security decline, but bears unlimited risk of loss should the price of the underlying security increase above the exercise price until the Fund covers its exposure. As with writing uncovered calls, the risk of writing uncovered put options is substantial. The writer of an uncovered put option bears a risk of loss if the value of the underlying instrument declines below the exercise price. Such loss could be substantial if there is a significant decline in the value of the underlying instrument. For combination writing, where the Fund writes both a put and a call on the same underlying instrument, the potential risk is unlimited. If a secondary market in options were to become unavailable, the Fund could not engage in losing transactions and would remain obligated until expiration or assignment. | ||||||||||||||||||
| Equity Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Equity Risk Investing in the Fund involves equity risk, which is the risk that the securities held by the Fund will fall in market value due to adverse market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate and the particular circumstances and performance of particular companies whose securities the Fund holds. An investment in the Fund represents an indirect economic stake in the securities owned by the Fund, which are for the most part traded on securities exchanges or in the OTC markets. The market value of these securities, like other market investments, may move up or down, sometimes rapidly and unpredictably. The net asset value of the Fund may at any point in time be less than the net asset value of the Fund at the time the shareholder invested in the Fund, even after taking into account any reinvestment of distributions. | ||||||||||||||||||
| Leverage Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Leverage Risk The Fund currently uses financial leverage for investment purposes by issuing preferred shares and is also permitted to use other types of financial leverage, such as through the issuance of debt securities or additional preferred shares and borrowing from financial institutions. As provided in the 1940 Act and subject to certain exceptions, the Fund may issue additional senior securities (which may be stock, such as preferred shares, and/or securities representing debt) only if immediately after such issuance the value of the Fund’s total assets, less certain ordinary course liabilities, exceeds 300% of the amount of the debt outstanding and exceeds 200% of the amount of preferred shares and debt outstanding. As of December 31, 2023, the amount of leverage represented approximately 12% of the Fund’s net assets. The Fund’s leveraged capital structure creates special risks not associated with unleveraged funds having a similar investment objective and policies. These include the possibility of greater loss and the likelihood of higher volatility of the net asset value of the Fund and the asset coverage for the preferred shares. Such volatility may increase the likelihood of the Fund having to sell investments in order to meet its obligations to make distributions on the preferred shares or principal or interest payments on debt securities, or to redeem preferred shares or repay debt, when it may be disadvantageous to do so. The Fund’s use of leverage may require it to sell portfolio investments at inopportune times in order to raise cash to redeem preferred shares or otherwise de-leverage so as to maintain required asset coverage amounts or comply with the mandatory redemption terms of any outstanding preferred shares. The use of leverage magnifies both the favorable and unfavorable effects of price movements in the investments made by the Fund. To the extent that the Fund employs leverage in its investment operations, the Fund is subject to substantial risk of loss. The Fund cannot assure you that borrowings or the issuance of preferred shares or notes will result in a higher yield or return to the holders of the common shares. Also, since the Fund utilizes leverage, a decline in net asset value could affect the ability of the Fund to make common share distributions and such a failure to make distributions could result in the Fund ceasing to qualify as a RIC under the Code. Any decline in the net asset value of the Fund’s investments would be borne entirely by the holders of common shares. Therefore, if the market value of the Fund’s portfolio declines, the leverage will result in a greater decrease in net asset value to the holders of common shares than if the Fund were not leveraged. This greater net asset value decrease will also tend to cause a greater decline in the market price for the common shares. The Fund might be in danger of failing to maintain the required asset coverage of its borrowings, notes or preferred shares or of losing its ratings on its notes or preferred shares or, in an extreme case, the Fund’s current investment income might not be sufficient to meet the distribution or interest requirements on its preferred shares, borrowings or notes. In order to counteract such an event, the Fund might need to liquidate investments in order to fund a redemption or repayment of some or all of the preferred shares, borrowings or notes. Preferred Share and Note Risk In addition, the Fund would pay (and the holders of common shares will bear) all costs and expenses relating to the issuance and ongoing maintenance of the preferred shares or notes, including the advisory fees on the incremental assets attributable to the preferred shares or notes. Holders of preferred shares and notes may have different interests than holders of common shares and may at times have disproportionate influence over the Fund’s affairs. As provided in the 1940 Act and subject to certain exceptions, the Fund may issue senior securities (which may be stock, such as preferred shares, and/or securities representing debt, such as notes) only if immediately after such issuance the value of the Fund’s total assets, less certain ordinary course liabilities, exceeds 300% of the amount of the debt outstanding (i.e., for every dollar of indebtedness outstanding, the Fund is required to have at least three dollars of assets) and exceeds 200% of the amount of preferred shares and debt outstanding (i.e., for every dollar in liquidation preference of preferred stock outstanding, the Fund is required to have two dollars of assets), which is referred to as the “asset coverage” required by the 1940 Act. In the event the Fund fails to maintain an asset coverage of 100% for any notes outstanding for certain periods of time, the 1940 Act requires that either an event of default be declared or that the holders of such notes have the right to elect a majority of the Fund’s Trustees until asset coverage recovers to 110%. In addition, holders of preferred shares, voting separately as a single class, have the right (subject to the rights of noteholders) to elect two members of the Board at all times and in the event dividends become two full years in arrears would have the right to elect a majority of the Trustees until such arrearage is completely eliminated. In addition, preferred shareholders have class voting rights on certain matters, including changes in fundamental investment restrictions and conversion of the Fund to open-end status, and accordingly can veto any such changes. Further, interest on notes would be payable when due and if the Fund does not pay interest when due, it will trigger an event of default and the Fund expects to be restricted from declaring dividends and making other distributions with respect to common shares and preferred shares. Upon the occurrence and continuance of an event of default, the holders of a majority in principal amount of a series of outstanding notes or the Trustee will be able to declare the principal amount of that series of notes immediately due and payable upon written notice to the Fund. The 1940 Act also generally restricts the Fund from declaring distributions on, or repurchasing, common or preferred shares unless notes have an asset coverage of 300% (200% in the case of declaring distributions on preferred shares). The Fund’s common shares are structurally subordinated as to income and residual value to any preferred shares or notes in the Fund’s capital structure, in terms of priority to income and payment in liquidation. Restrictions imposed on the declarations and payment of dividends or other distributions to the holders of the Fund’s common shares and preferred shares, both by the 1940 Act and by requirements imposed by rating agencies, might impair the Fund’s ability to maintain its qualification as a RIC for U.S. federal income tax purposes. While the Fund intends to redeem its preferred shares or notes to the extent necessary to enable the Fund to distribute its income as required to maintain its qualification as a RIC under the Code, there can be no assurance that such actions can be effected in time to meet the Code requirements. Portfolio Guidelines of Rating Agencies for Preferred Shares and/or Credit Facility Impact on Common Shares table is furnished in response to requirements of the SEC. It is designed to illustrate the effect of leverage on common share total return, assuming investment portfolio total returns (comprised of net investment income of the Fund, realized gains or losses of the Fund and changes in the value of the securities held in the Fund’s portfolio) of -10%, -5%, 0%, 5% and 10%. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. These assumed investment portfolio returns are hypothetical figures and are not necessarily indicative of the investment portfolio returns experienced or expected to be experienced by the Fund. The table further reflects leverage representing 12% of the Fund’s net assets (the Fund’s amount of outstanding financial leverage at December 31, 2023), the Fund’s current projected blended annual average leverage dividend or interest rate of 5.00% (the average dividend rate on the Fund’s outstanding financial leverage at December 31, 2023), a base management fee at an annual rate of 1.00% of the liquidation preference of any outstanding preferred shares and estimated annual incremental expenses attributable to any outstanding preferred shares of 0.01% of the Fund’s net assets attributable to common shares. Assumed Return on Portfolio (Net of Expenses) (10 )% (5 )% 0 % 5 % 10 % Corresponding Return to Common Shareholder (12.18 )% (6.50 )% (0.82 )% 4.86 % 10.54 % Common share total return is composed of two elements—the common share distributions paid by the Fund (the amount of which is largely determined by the taxable income of the Fund (including realized gains or losses) after paying interest on any debt and/or dividends on any preferred shares) and unrealized gains or losses on the value of the securities the Fund owns. As required by SEC rules, the table assumes that the Fund is more likely to suffer capital losses than to enjoy total return. For example, to assume a total return of 0% the Fund must assume that the income it receives on its investments is entirely offset by expenses and losses in the value of those investments. Market Discount Risk. | ||||||||||||||||||
| Foreign Securities Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Foreign Securities Risk Because many of the world’s Gold Companies and Natural Resources Companies are located outside of the United States, the Fund may have a significant portion of its investments in securities that are traded in foreign markets and that are not subject to the requirements of the U.S. securities laws, markets and accounting requirements. Investments in the securities of foreign issuers involve certain considerations and risks not ordinarily associated with investments in securities of domestic issuers and such securities may be more volatile than those of issuers located in the United States. Foreign companies are not generally subject to uniform accounting, auditing and financial standards and requirements comparable to those applicable to U.S. companies. The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries, and there may be greater levels of price volatility in foreign markets. Foreign securities exchanges, brokers and listed companies may be subject to less government supervision and regulation than exists in the United States. Dividend and interest income may be subject to withholding and other foreign taxes, which may adversely affect the net return on such investments. There may be difficulty in obtaining or enforcing a court judgment abroad. In addition, it may be difficult to effect repatriation of capital invested in certain countries. In addition, with respect to certain countries, there are risks of expropriation, confiscatory taxation, political or social instability or diplomatic developments that could affect assets of the Fund held in foreign countries. Dividend income the Fund receives from foreign securities may not be eligible for the special tax treatment applicable to qualified dividend income. Moreover, certain equity investments in foreign issuers classified as passive foreign investment companies may be subject to additional taxation risk. There may be less publicly available information about a foreign company than a U.S. company, and foreign companies may not be subject to accounting, auditing, and financial reporting standards and requirements comparable to or as uniform as those of U.S. companies. Foreign securities markets may have substantially less volume than U.S. securities markets and some foreign company securities are less liquid and their prices more volatile than securities of otherwise comparable U.S. companies. A portfolio of foreign securities may also be adversely affected by fluctuations in the rates of exchange between the currencies of different nations and by exchange control regulations, as there is generally less government supervision and regulation of exchanges, brokers, and issuers than there is in the U.S. The Fund might have greater difficulty taking appropriate legal action in non-U.S. courts and there may be less developed bankruptcy laws. Foreign markets also have different clearance and settlement procedures that could cause the Fund to encounter difficulties in purchasing and selling securities on such markets and may result in the Fund missing attractive investment opportunities or experiencing loss. In addition, a portfolio that includes foreign securities can expect to have a higher expense ratio because of the increased transaction costs on non-U.S. securities markets and the increased costs of maintaining the custody of foreign securities. Investments in foreign securities will expose the Fund to the direct or indirect consequences of political, social or economic changes in the countries that issue the securities or in which the issuers are located. Certain countries in which the Fund may invest have historically experienced, and may continue to experience, high rates of inflation, high interest rates, exchange rate fluctuations, large amounts of external debt, balance of payments and trade difficulties and extreme poverty and unemployment. Many of these countries are also characterized by political uncertainty and instability. The cost of servicing external debt will generally be adversely affected by rising international interest rates because many external debt obligations bear interest at rates which are adjusted based upon international interest rates. The Fund also may purchase ADRs or U.S. dollar-denominated securities of foreign issuers. ADRs are receipts issued by U.S. banks or trust companies in respect of securities of foreign issuers held on deposit for use in the U.S. securities markets. While ADRs may not necessarily be denominated in the same currency as the securities into which they may be converted, many of the risks associated with foreign securities may also apply to ADRs. In addition, the underlying issuers of certain depositary receipts, particularly unsponsored or unregistered depositary receipts, are under no obligation to distribute shareholder communications to the holders of such receipts, or to pass through to them any voting rights with respect to the deposited securities. | ||||||||||||||||||
| E M U And Redenomination Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | EMU and Redenomination Risk As the European debt crisis progressed, the possibility of one or more Eurozone countries exiting the European Monetary Union (“EMU”), or even the collapse of the Euro as a common currency, arose, creating significant volatility at times in currency and financial markets generally. The effects of the collapse of the Euro, or of the exit of one or more countries from the EMU, on the U.S. and global economies and securities markets are impossible to predict, and any such events could have a significant adverse impact on the value and risk profile of the Fund’s portfolio. Any partial or complete dissolution of the EMU could have significant adverse effects on currency and financial markets, and on the values of the Fund’s portfolio investments. If one or more EMU countries were to stop using the Euro as its primary currency, the Fund’s investments in such countries may be redenominated into a different or newly adopted currency. As a result, the value of those investments could decline significantly and unpredictably. In addition, securities or other investments that are redenominated may be subject to foreign currency risk, liquidity risk and valuation risk to a greater extent than similar investments currently denominated in Euros. To the extent a currency used for redenomination purposes is not specified in respect of certain EMU-related investments, or should the Euro cease to be used entirely, the currency in which such investments are denominated may be unclear, making such investments particularly difficult to value or dispose of. The Fund may incur additional expenses to the extent it is required to seek judicial or other clarification of the denomination or value of such securities. | ||||||||||||||||||
| Emerging Markets Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Emerging Markets Risk The Fund may invest without limit in securities of issuers whose primary operations or principal trading market are located in an “emerging market.” An “emerging market” country is any country that is considered to be an emerging or developing country by the World Bank. The considerations noted above in “Foreign Securities Risk” are generally intensified for investments in emerging market countries. Emerging market countries typically have economic and political systems that are less fully developed, and can be expected to be less stable than those of more developed countries. Investing in securities of companies in emerging markets may entail special risks relating to potential political and economic instability and the risks of expropriation, nationalization, confiscation or the imposition of restrictions on foreign investment, the lack of hedging instruments and restrictions on repatriation of capital invested. Economies of such countries can be subject to rapid and unpredictable rates of inflation or deflation. Emerging securities markets are substantially smaller, less developed, less liquid and more volatile than the major securities markets. The limited size of emerging securities markets and limited trading volume compared to the volume of trading in U.S. securities could cause prices to be erratic for reasons apart from factors that affect the quality of the securities. For example, limited market size may cause prices to be unduly influenced by traders who control large positions. Adverse publicity and investors’ perceptions, whether or not based on fundamental analysis, may decrease the value and liquidity of portfolio securities, especially in these markets. Other risks include high concentration of market capitalization and trading volume in a small number of issuers representing a limited number of industries, as well as a high concentration of investors and financial intermediaries; overdependence on exports, including gold and natural resources exports, making these economies vulnerable to changes in commodity prices; overburdened infrastructure and obsolete or unseasoned financial systems; environmental problems; less developed legal systems; and less reliable securities custodial services and settlement practices. Certain emerging markets may also face other significant internal or external risks, including the risk of war and civil unrest. For all of these reasons, investments in emerging markets may be considered speculative. | ||||||||||||||||||
| Frontier Markets Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Frontier Markets Risk Frontier countries generally have smaller economies or less developed capital markets than traditional emerging markets, and, as a result, the risks of investing in emerging market countries are magnified in frontier countries. The economies of frontier countries are less correlated to global economic cycles than those of their more developed counterparts and their markets have low trading volumes and the potential for extreme price volatility and illiquidity. This volatility may be further heightened by the actions of a few major investors. For example, a substantial increase or decrease in cash flows of mutual funds investing in these markets could significantly affect local stock prices and, therefore, the net asset value of Fund’s common shares. These factors make investing in frontier countries significantly riskier than in other countries and any one of them could cause the net asset value of a fund’s shares to decline. Governments of many frontier countries in which the Fund may invest may exercise substantial influence over many aspects of the private sector. In some cases, the governments of such frontier countries may own or control certain companies. Accordingly, government actions could have a significant effect on economic conditions in a frontier country and on market conditions, prices and yields of securities in the Fund’s portfolio. Moreover, the economies of frontier countries may be heavily dependent upon international trade and, accordingly, have been and may continue to be, adversely affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which they trade. These economies also have been and may continue to be adversely affected by economic conditions in the countries with which they trade. | ||||||||||||||||||
| Foreign Currency Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Foreign Currency Risk The Fund expects to invest in companies whose securities are denominated or quoted in currencies other than U.S. dollars or have significant operations or markets outside of the United States. In such instances, the Fund will be exposed to currency risk, including the risk of fluctuations in the exchange rate between U.S. dollars (in which the Fund’s shares are denominated) and such foreign currencies, the risk of currency devaluations and the risks of non-exchangeability and blockage. As non-U.S. securities may be purchased with and payable in currencies of countries other than the U.S. dollar, the value of these assets measured in U.S. dollars may be affected favorably or unfavorably by changes in currency rates and exchange control regulations. Fluctuations in currency rates may adversely affect the ability of the Investment Adviser to acquire such securities at advantageous prices and may also adversely affect the performance of such assets. Certain non-U.S. currencies, primarily in developing countries, have been devalued in the past and might face devaluation in the future. Currency devaluations generally have a significant and adverse impact on the devaluing country’s economy in the short and intermediate term and on the financial condition and results of companies’ operations in that country. Currency devaluations may also be accompanied by significant declines in the values and liquidity of equity and debt securities of affected governmental and private sector entities generally. To the extent that affected companies have obligations denominated in currencies other than the devalued currency, those companies may also have difficulty in meeting those obligations under such circumstances, which in turn could have an adverse effect upon the value of the Fund’s investments in such companies. There can be no assurance that current or future developments with respect to foreign currency devaluations will not impair the Fund’s investment flexibility, its ability to achieve its investment objectives or the value of certain of its foreign currency denominated investments. | ||||||||||||||||||
| Tax Consequences Of Foreign Investing [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Tax Consequences of Foreign Investing The Fund’s transactions in foreign currencies, foreign currency-denominated debt obligations and certain foreign currency options, futures contracts and forward contracts (and similar instruments) may give rise to ordinary income or loss to the extent such income or loss results from fluctuations in the value of the foreign currency concerned. This treatment could increase or decrease the Fund’s ordinary income distributions to you, and may cause some or all of the Fund’s previously distributed income to be classified as a return of capital. In certain cases, the Fund may make an election to treat gain or loss attributable to certain investments as capital gain or loss. | ||||||||||||||||||
| Market Discount Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Market Discount Risk The Fund is a non-diversified, closed-end management investment company. Whether investors will realize gains or losses upon the sale of securities of the Fund will depend upon the market price of the securities at the time of sale, which may be less or more than the Fund’s net asset value per share or the liquidation value of any Fund preferred shares issued. Since the market price of any additional securities the Fund may issue will be affected by such factors as the Fund’s dividend and distribution levels (which are in turn affected by expenses), dividend and distribution stability, net asset value, market liquidity, the relative demand for and supply of such securities in the market, general market and economic conditions and other factors beyond the control of the Fund, we cannot predict whether any such securities will trade at, below or above net asset value or at, below or above their public offering price or at, below or above their liquidation value, as applicable. For example, common shares of closed-end funds often trade at a discount to their net asset values and the Fund’s common shares may trade at such a discount. This risk may be greater for investors expecting to sell their securities of the Fund soon after the completion of a public offering for such securities. The risk of a market price discount from net asset value is separate and in addition to the risk that net asset value itself may decline. The Fund’s securities are designed primarily for long-term investors, and investors in the shares should not view the Fund as a vehicle for trading purposes. | ||||||||||||||||||
| Common Stock Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Common Stock Risk Common stock of an issuer in the Fund’s portfolio may decline in price for a variety of reasons, including if the issuer fails to make anticipated dividend payments because the issuer of the security experiences a decline in its financial condition. Common stock in which the Fund invests is structurally subordinated as to income and residual value to preferred stock, bonds and other debt instruments in a company’s capital structure, in terms of priority to corporate income, and therefore will be subject to greater dividend risk than preferred stock or debt instruments of such issuers. In addition, while common stock has historically generated higher average returns than fixed income securities, common stock has also experienced significantly more volatility in those returns. | ||||||||||||||||||
| Convertible Securities Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Convertible Securities Risk Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In the absence of adequate anti-dilution provisions in a convertible security, dilution in the value of the Fund’s holding may occur in the event the underlying stock is subdivided, additional equity securities are issued for below market value, a stock dividend is declared or the issuer enters into another type of corporate transaction that has a similar effect. The value of a convertible security is influenced by the value of the underlying equity security. Convertible debt securities and preferred stocks may depreciate in value if the market value of the underlying equity security declines or if rates of interest increase. In addition, although debt securities are liabilities of a corporation which the corporation is generally obligated to repay at a specified time, debt securities, particularly convertible debt securities, are often subordinated to the claims of some or all of the other creditors of the corporation. Mandatory conversion securities (securities that automatically convert into equity securities at a future date) may limit the potential for capital appreciation and, in some instances, are subject to complete loss of invested capital. Other innovative convertibles include “equity-linked” securities, which are securities or derivatives that may have fixed, variable, or no interest payments prior to maturity, may convert (at the option of the holder or on a mandatory basis) into cash or a combination of cash and equity securities, and may be structured to limit the potential for capital appreciation. Equity-linked securities may be illiquid and difficult to value and may be subject to greater credit risk than that of other convertibles. Moreover, mandatory conversion securities and equity-linked securities have increased the sensitivity of the convertible securities market to the volatility of the equity markets and to the special risks of those innovations, which may include risks different from, and possibly greater than, those associated with traditional convertible securities. Preferred stocks are equity securities in the sense that they do not represent a liability of the corporation. In the event of liquidation of the corporation, and after its creditors have been paid or provided for, holders of preferred stock are generally entitled to a preference as to the assets of the corporation before any distribution may be made to the holders of common stock. Debt securities normally do not have voting rights. Preferred stocks may have no voting rights or may have voting rights only under certain circumstances. ● Credit Risk ● Market Risk underlying securities. Thus they expose the Fund to greater downside risk than traditional convertible securities, but generally less than that of the underlying common stock. ● Interest Rate Risk for Convertible Securities ● Sector Risk ● Dilution Risk. In the absence of adequate anti-dilution provisions in a convertible security, dilution in the value of the Fund’s holding may occur in the event the underlying stock is subdivided, additional equity securities are issued for below market value, a stock dividend is declared, or the issuer enters into an-other type of corporate transaction that has a similar effect. | ||||||||||||||||||
| Income Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Income Risk The income shareholders receive from the Fund is expected to be based primarily on income the Fund earns from its investment strategy of writing covered calls and dividends and other distributions received from its investments. If the Fund’s covered call strategy fails to generate sufficient income or the distribution rates or yields of the Fund’s holdings decrease, shareholders’ income from the Fund could decline. | ||||||||||||||||||
| Distribution Risk For Equity Income Portfolio Securities [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Distribution Risk for Equity Income Portfolio Securities In selecting equity income securities in which the Fund will invest, the Investment Adviser will consider the issuer’s history of making regular periodic distributions (i.e., dividends) to its equity holders. An issuer’s history of paying dividends or other distributions, however, does not guarantee that the issuer will continue to pay dividends or other distributions in the future. The dividend income stream associated with equity income securities generally is not guaranteed and will be subordinate to payment obligations of the issuer on its debt and other liabilities. Accordingly, an issuer may forgo paying dividends on its equity securities. In addition, because in most instances issuers are not obligated to make periodic distributions to the holders of their equity securities, such distributions or dividends generally may be discontinued at the issuer’s discretion. | ||||||||||||||||||
| Special Risks Related To Preferred Securities [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks Related to Preferred Securities There are special risks associated with the Fund’s investing in preferred securities, including: Deferral Non-Cumulative Dividends Subordination Liquidity Limited Voting Rights Special Redemption Rights | ||||||||||||||||||
| Deflation Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Deflation Risk Deflation risk is the risk that prices throughout the economy decline over time, which may have an adverse effect on the market valuation of companies, their assets and their revenues. In addition, deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio. | ||||||||||||||||||
| Illiquid Investments Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Illiquid Investments Risk Although the Fund expects that its portfolio will primarily be comprised of liquid securities, the Fund may invest up to 15% of its assets in unregistered securities and otherwise illiquid investments. Unregistered securities are securities that cannot be sold publicly in the United States without registration under the Securities Act. An illiquid investment is a security or other investment that cannot be disposed of within seven days in the ordinary course of business at approximately the value at which the Fund has valued the investment. Unregistered securities often can be resold only in privately negotiated transactions with a limited number of purchasers or in a public offering registered under the Securities Act. Considerable delay could be encountered in either event and, unless otherwise contractually provided for, the Fund’s proceeds upon sale may be reduced by the costs of registration or underwriting discounts. The difficulties and delays associated with such transactions could result in the Fund’s inability to realize a favorable price upon disposition of unregistered securities, and at times might make disposition of such securities impossible. In addition, the Fund may be unable to sell other illiquid investments when it desires to do so, resulting in the Fund obtaining a lower price or being required to retain the investment. Illiquid investments generally must be valued at fair value, which is inherently less precise than utilizing market values for it desires to do so, resulting in the Fund obtaining a lower price or being required to retain the investment. liquid investments, and may lead to differences between the price at which a security is valued for determining the Fund’s net asset value and the price the Fund actually receives upon sale. | ||||||||||||||||||
| Investment Companies [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Investment Companies The Fund may invest in the securities of other investment companies, including exchange traded funds, to the extent permitted by law. To the extent the Fund invests in the common equity of investment companies, the Fund will bear its ratable share of any such investment company’s expenses, including management fees. The Fund will also remain obligated to pay management fees to the Investment Adviser with respect to the assets invested in the securities of other investment companies. In these circumstances holders of the Fund’s common shares will be in effect subject to duplicative investment expenses. | ||||||||||||||||||
| Special Risks Of Derivative Transactions [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks of Derivative Transactions The Fund may participate in certain derivative transactions, as described herein. Such transactions entail certain execution, market, liquidity, hedging and tax risks. Participation in derivatives transactions involves investment risks and transaction costs to which the Fund would not be subject absent the use of these strategies. If the Investment Adviser’s prediction of movements in the direction of the securities or other referenced instruments or markets is inaccurate, the consequences to the Fund may leave the Fund in a worse position than if it had not used such strategies. Risks inherent in the use of derivative transactions include: ● dependence on the Investment Adviser’s ability to predict correctly movements in the direction of the relevant measure; ● imperfect correlation between the price of the derivative instrument and movements in the prices of the referenced assets; ● the fact that skills needed to use these strategies are different from those needed to select portfolio securities; ● the possible absence of a liquid secondary market for any particular instrument at any time; ● the possible need to defer closing out certain hedged positions to avoid adverse tax consequences; ● the possible inability of the Fund to purchase or sell a security or instrument at a time that otherwise would be favorable for it to do so, or the possible need for the Fund to sell a security or instrument at a disadvantageous time due to a need for the Fund to remain in compliance with the 1940 Act restrictions regarding derivatives transactions; and ● the creditworthiness of counterparties. Certain derivatives may be traded on foreign exchanges. Such transactions may not be regulated as effectively as similar transactions in the United States, may not involve a clearing mechanism and related guarantees, and are subject to the risk of governmental actions affecting trading in, or the prices of, foreign securities. The value of such positions also could be adversely affected by (i) other complex foreign political, legal and economic factors, (ii) lesser availability than in the United States of data on which to make trading decisions, (iii) delays in the ability of the Fund to act upon economic events occurring in the foreign markets during non-business hours in the United States, (iv) the imposition of different exercise and settlement terms and procedures and margin requirements than in the United States, and (v) less trading volume. Exchanges on which derivatives are traded may impose limits on the positions that the Fund may take in certain circumstances. Many OTC derivatives are valued on the basis of dealers’ pricing of these instruments. However, the price at which dealers value a particular derivative and the price which the same dealers would actually be willing to pay for such derivative should the Fund wish or be forced to sell such position may be materially different. Such differences can result in an overstatement of the Fund’s net asset value and may materially adversely affect the Fund in situations in which the Fund is required to sell derivative instruments. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Fund’s hedging transactions will be effective. Derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. Future Commodity Futures Trading Commission (“CFTC”) or SEC rulemakings could potentially further limit or completely restrict the Fund’s ability to use these instruments as a part of the Fund’s investment strategy, increase the costs of using these instruments or make them less effective. Limits or restrictions applicable to the counterparties with which the Fund engages in derivative transactions could also prevent the Fund from using these instruments or affect the pricing or other factors relating to these instruments or may change the availability of certain investments. New regulation may make derivatives more costly, may limit the availability of derivatives, or may otherwise adversely affect the value or performance of derivatives. Forward Foreign Currency Exchange Contracts Counterparty Risk The counterparty risk for cleared derivatives is generally lower than for uncleared OTC derivative transactions since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations under the derivative contract. However, there can be no assurance that a clearing organization, or its members, will satisfy its obligations to the Fund, or that the Fund would be able to recover the full amount of assets deposited on its behalf with the clearing organization in the event of the default by the clearing organization or the Fund’s clearing broker. In addition, cleared derivative transactions benefit from daily marking-to-market and settlement, and segregation and minimum capital requirements applicable to intermediaries. Uncleared OTC derivative transactions generally do not benefit from such protections. This exposes the Fund to the risk that a counterparty will not settle a transaction in accordance with its terms and conditions because of a dispute over the terms of the contract (whether or not bona fide) or because of a credit or liquidity problem, thus causing the Fund to suffer a loss. Such “counterparty risk” is accentuated for contracts with longer maturities where events may intervene to prevent settlement, or where the Fund has concentrated its transactions with a single or small group of counterparties. | ||||||||||||||||||
| Non Investment Grade Securities [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Non-Investment Grade Securities The Fund may invest in securities rated below investment grade by recognized statistical rating agencies or unrated securities of comparable quality. The prices of these lower grade securities are more sensitive to negative developments, such as a decline in the issuer’s revenues or a general economic downturn, than are the prices of higher grade securities. Securities of below investment grade quality—those securities rated below “Baa” by Moody’s or below “BBB” by S&P (or unrated securities considered by the Investment Adviser to be of comparable quality)—are predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal when due and therefore involve a greater risk of default. Securities rated below investment grade commonly are referred to as “junk bonds” or “high yield” securities and generally pay a premium above the yields of U.S. government securities or securities of investment grade issuers because they are subject to greater risks than these securities. These risks, which reflect their speculative character, include the following: ● greater volatility; ● greater credit risk and risk of default; ● potentially greater sensitivity to general economic or industry conditions; ● potential lack of attractive resale opportunities (illiquidity); and ● additional expenses to seek recovery from issuers who default. In addition, the prices of these lower grade securities are more sensitive to negative developments, such as a decline in the issuer’s revenues or a general economic downturn, than are the prices of higher grade securities. Lower grade securities tend to be less liquid than investment grade securities. The market value of lower grade securities may be more volatile than the market value of investment grade securities and generally tends to reflect the market’s perception of the creditworthiness of the issuer and short-term market developments to a greater extent than investment grade securities, which primarily reflect fluctuations in general levels of interest rates. Ratings are relative, subjective, and not absolute standards of quality. Securities ratings are based largely on the issuer’s historical financial condition and the rating agencies’ analysis at the time of rating. Consequently, the rating assigned to any particular security is not necessarily a reflection of the issuer’s current financial condition. The Fund may purchase securities of companies that are experiencing significant financial or business difficulties, including companies involved in bankruptcy or other reorganization and liquidation proceedings. Although such investments may result in significant financial returns to the Fund, they involve a substantial degree of risk. The level of analytical sophistication, both financial and legal, necessary for successful investments in issuers experiencing significant business and financial difficulties is unusually high. There can be no assurance that the Fund will correctly evaluate the value of the assets collateralizing its investments or the prospects for a successful reorganization or similar action. In any reorganization or liquidation proceeding relating to a portfolio investment, the Fund may lose all or part of its investment or may be required to accept collateral with a value less than the amount of the Fund’s initial investment. As a part of its investments in lower grade securities, the Fund may invest in securities of issuers in default. The Fund will invest in securities of issuers in default only when the Investment Adviser believes that such issuers will honor their obligations, emerge from bankruptcy protection and the value of these securities will appreciate. By investing in the securities of issuers in default, the Fund bears the risk that these issuers will not continue to honor their obligations or emerge from bankruptcy protection or that the value of these securities will not otherwise appreciate. In addition to using statistical rating agencies and other sources, the Investment Adviser will also perform its own analysis of issuers in seeking investments that it believes to be underrated (and thus higher yielding) in light of the financial condition of the issuer. Its analysis of issuers may include, among other things, current and anticipated cash flow and borrowing requirements, value of assets in relation to historical cost, strength of management, responsiveness to business conditions, credit standing and current anticipated results of operations. In selecting investments for the Fund, the Investment Adviser may also consider general business conditions, anticipated changes in interest rates and the outlook for specific industries. Subsequent to its purchase by the Fund, an issue of securities may cease to be rated or its rating may be reduced. In addition, it is possible that statistical rating agencies might change their ratings of a particular issue to reflect subsequent events on a timely basis. Moreover, such ratings do not assess the risk of a decline in market value. None of these events will require the sale of the securities by the Fund, although the Investment Adviser will consider these events in determining whether the Fund should continue to hold the securities. Fixed income securities, including non-investment grade securities and comparable unrated securities, frequently have call or buy-back features that permit their issuers to call or repurchase the securities from their holders, such as the Fund. If an issuer exercises these rights during periods of declining interest rates, the Fund may have to replace the security with a lower yielding security, thus resulting in a decreased return for the Fund. The market for non-investment grade and comparable unrated securities has experienced periods of significantly adverse price and liquidity several times, particularly at or around times of economic recession. Past market recessions have adversely affected the value of such securities and the ability of certain issuers of such securities to repay principal and pay interest thereon or to refinance such securities. The market for those securities may react in a similar fashion in the future. | ||||||||||||||||||
| Decision Making Authority Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Decision-Making Authority Risk. | ||||||||||||||||||
| Dependence On Key Personnel [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Dependence on Key Personnel The Investment Adviser is dependent upon the expertise of Mr. Mario J. Gabelli. If the Investment Adviser were to lose the services of Mr. Gabelli, it could be adversely affected. There can be no assurance that a suitable replacement could be found for Mr. Gabelli in the event of his death, resignation, retirement or inability to act on behalf of the Investment Adviser. The Fund is dependent upon the expertise of Vincent Hugonnard-Roche as the sole option strategist on the Fund’s portfolio management team. If the Fund were to lose the services of Mr. Roche, it could be temporarily adversely affected until a suitable replacement could be found. | ||||||||||||||||||
| Long Term Objective Not A Complete Investment Program [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Long Term Objective; Not a Complete Investment Program The Fund is intended for investors seeking a high level of current income. The Fund is not meant to provide a vehicle for those who wish to exploit short-term swings in the stock market. An investment in shares of the Fund should not be considered a complete investment program. Each shareholder should take into account the Fund’s investment objectives as well as the shareholder’s other investments when considering an investment in the Fund. | ||||||||||||||||||
| Management Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Management Risk The Fund is subject to management risk because it is an actively managed portfolio. The Investment Adviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results. | ||||||||||||||||||
| Non Diversified Status [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Non-Diversified Status The Fund is classified as a “non-diversified” investment company under the 1940 Act, which means the Fund is not limited by the 1940 Act in the proportion of its assets that may be invested in the securities of a single issuer. As a non-diversified investment company, the Fund may invest in the securities of individual issuers to a greater degree than a diversified investment company. As a result, the Fund may be more vulnerable to events affecting a single issuer and therefore, subject to greater volatility than a fund that is more broadly diversified. Accordingly, an investment in the Fund may present greater risk to an investor than an investment in a diversified company. | ||||||||||||||||||
| Market Disruption And Geopolitical Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Market Disruption and Geopolitical Risk General economic and market conditions, such as interest rates, availability of credit, inflation rates, economic uncertainty, supply chain disruptions, labor shortages, energy and other resource shortages, changes in laws, trade barriers, currency exchange controls and national and international political circumstances (including governmental responses to public health crises or the spread of infectious diseases), may have long-term negative effects on the U.S. and worldwide financial markets and economy. These conditions have resulted in, and in many cases continue to result in, greater price volatility, less liquidity, widening credit spreads and a lack of price transparency, with many securities remaining illiquid and of uncertain value. Such market conditions may adversely affect the Company, including by making valuation of some of the Fund’s securities uncertain and/or result in sudden and significant valuation increases or declines in the Fund’s holdings. Risks resulting from any future debt or other economic crisis could also have a detrimental impact on the global economy, the financial condition of financial institutions and the Fund’s business, financial condition and results of operation. Market and economic disruptions have affected, and may in the future affect, consumer confidence levels and spending, personal bankruptcy rates, levels of incurrence and default on consumer debt and home prices, among other factors. To the extent uncertainty regarding the U.S. or global economy negatively impacts consumer confidence and consumer credit factors, the Fund could be significantly and adversely affected. Downgrades to the credit ratings of major banks could result in increased borrowing costs for such banks and negatively affect the broader economy. Moreover, Federal Reserve policy, including with respect to certain interest rates, may also adversely affect the value, volatility and liquidity of dividend- and interest-paying securities. Market volatility, rising interest rates and/or a return to unfavorable economic conditions could impair the Fund’s ability to achieve its investment objectives. The occurrence of events similar to those in recent years, such as localized wars, instability, new and ongoing pandemics, epidemics or outbreaks of infectious diseases in certain parts of the world, and catastrophic events such as fires, floods, earthquakes, tornadoes, hurricanes and global health epidemics, terrorist attacks in the U.S. and around the world, social and political discord, debt crises sovereign debt downgrades, increasingly strained relations between the U.S. and a number of foreign countries, new and continued political unrest in various countries, the exit or potential exit of one or more countries from the EU or the EMU, continued changes in the balance of political power among and within the branches of the U.S. government, government shutdowns, among others, may result in market volatility, may have long-term effects on the U.S. and worldwide financial markets, and may cause further economic uncertainties in the U.S. and worldwide. In particular, the consequences of the Russian military invasion of Ukraine, the impact on inflation and increased disruption to supply chains and energy resources may impact the Fund’s portfolio companies, result in an economic downturn or recession either globally or locally in the U.S. or other economies, reduce business activity, spawn additional conflicts (whether in the form of traditional military action, reignited “cold” wars or in the form of virtual warfare such as cyberattacks) with similar and perhaps wider ranging impacts and consequences and have an adverse impact on the Fund’s returns and net asset values. In response to the conflict between Russia and Ukraine, the U.S. and other countries have imposed sanctions or other restrictive actions against Russia, Russian-backed separatist regions in Ukraine, and certain banks, companies, government officials and other individuals in Russia and Belarus. Any of the above factors, including sanctions, export controls, tariffs, trade wars and other governmental actions, could have a material adverse effect on the Fund. The Fund has no way to predict the duration or outcome of the situation, as the conflict and government reactions are rapidly developing and beyond the Fund’s control. Prolonged unrest, military activities, or broad-based sanctions could have a material adverse effect on companies in which the Fund invests. Such consequences also may increase such companies’ funding costs or limit their access to the capital markets. The current political climate has intensified concerns about a potential trade war between China and the U.S., as each country has imposed tariffs on the other country’s products. These actions may trigger a significant reduction in international trade, the oversupply of certain manufactured goods, substantial price reductions of goods and possible failure of individual companies and/or large segments of China’s export industry, which could have a negative impact on the Fund’s performance. U.S. companies that source material and goods from China and those that make large amounts of sales in China would be particularly vulnerable to an escalation of trade tensions. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. Any of these effects could have a material adverse effect on the Fund. Periods of volatility still remain, and risks to a robust resumption of growth persist. Federal Reserve policy, including with respect to certain interest rates, may adversely affect the value, volatility and liquidity of dividend and interest paying securities. Market volatility, dramatic changes to interest rates and/or a return to unfavorable economic conditions may lower the Fund’s performance or impair the Fund’s ability to achieve its investment objective. | ||||||||||||||||||
| Economic Events And Market Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Economic Events and Market Risk. Risks resulting from any future debt or other economic crisis could also have a detrimental impact on the global economic recovery, the financial condition of financial institutions and our business, financial condition and results of operation. Market and economic disruptions have affected, and may in the future affect, consumer confidence levels and spending, personal bankruptcy rates, levels of incurrence and default on consumer debt and home prices, among other factors. To the extent uncertainty regarding the U.S. or global economy negatively impacts consumer confidence and consumer credit factors, our business, financial condition and results of operations could be significantly and adversely affected. Downgrades to the credit ratings of major banks could result in increased borrowing costs for such banks and negatively affect the broader economy. Moreover, Federal Reserve policy, including with respect to certain interest rates, may also adversely affect the value, volatility and liquidity of dividend- and interest-paying securities. Market volatility, rising interest rates and/or a return to unfavorable economic conditions could impair the Fund’s ability to achieve its investment objectives. | ||||||||||||||||||
| Regulation And Government Intervention Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Regulation and Government Intervention Risk Changes enacted by the current presidential administration could significantly impact the regulation of financial markets in the U.S. Areas subject to potential change, amendment or repeal include trade and foreign policy, corporate tax rates, energy and infrastructure policies, the environment and sustainability, criminal and social justice initiatives, immigration, healthcare and the oversight of certain federal financial regulatory agencies and the Federal Reserve. Certain of these changes can, and have, been effectuated through executive order. For example, the current administration has taken steps to rejoin the Paris climate accord of 2015 and incentivize certain clean energy technologies, cancel the Keystone XL pipeline, provide military support to Ukraine and change immigration enforcement priorities. Other potential changes that could be pursued by the current presidential administration could include an increase in the corporate income tax rate; changes to regulatory enforcement priorities; and spending on clean energy and infrastructure. It is not possible to predict which, if any, of these actions will be taken or, if taken, their effect on the economy, securities markets or the financial stability of the U.S. The Fund may be affected by governmental action in ways that are not foreseeable, and there is a possibility that such actions could have a significant adverse effect on the Fund and the Fund’s ability to achieve its investment objectives. Additional risks arising from the differences in expressed policy preferences among the various constituencies in the branches of the U.S. government has led in the past, and may lead in the future, to short-term or prolonged policy impasses, which could, and has, resulted in shutdowns of the U.S. federal government. U.S. federal government shutdowns, especially prolonged shutdowns, could have a significant adverse impact on the economy in general and could impair the ability of issuers to raise capital in the securities markets. Any of these effects could have a material adverse effect on the Fund’s net asset value. In addition, the rules dealing with the U.S. federal income taxation are constantly under review by persons involved in the legislative process and by the IRS and the U.S. Treasury Department. The Tax Cuts and Jobs Act made substantial changes to the Code. Among those changes were a significant permanent reduction in the generally applicable corporate tax rate, changes in the taxation of individuals and other non-corporate taxpayers that generally but not universally reduce their taxes on a temporary basis subject to “sunset” provisions, the elimination or modification of various previously allowed deductions (including substantial limitations on the deductibility of interest and, in the case of individuals, the deduction for personal state and local taxes), certain additional limitations on the deduction of net operating losses, certain preferential rates of taxation on certain dividends and certain business income derived by non-corporate taxpayers in comparison to other ordinary income recognized by such taxpayers, and significant changes to the international tax rules. In addition, the Biden administration signed into law the Inflation Reduction Act, which modifies key aspects of the Code, including by creating an alternative minimum tax on certain corporations and an excise tax on stock repurchases by certain corporations. The effect of these and other changes is uncertain, both in terms of the direct effect on the taxation of an investment in the Fund’s shares and their indirect effect on the value of the Fund’s assets, Fund shares or market conditions generally. In addition, the U.S. government has proposed and adopted multiple regulations that could have a long-lasting impact on the Fund and on the closed-end fund industry in general. The SEC’s final rules and amendments that modernize reporting and disclosure, along with other potential upcoming regulations, could, among other things, restrict the Fund’s ability to engage in transactions, and/or increase overall expenses of the Fund. The Fund may be affected by governmental action in ways that are not foreseeable, and there is a possibility that such actions could have a significant adverse effect on the Fund and its ability to achieve its investment objective. | ||||||||||||||||||
| L I B O R Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | LIBOR Risk The Fund may be exposed to financial instruments that are tied to the London Interbank Offered Rate (“LIBOR”) to determine payment obligations, financing terms, hedging strategies or investment value. The Fund’s investments may pay interest at floating rates based on LIBOR or may be subject to interest caps or floors based on LIBOR. The Fund may also obtain financing at floating rates based on LIBOR. Derivative instruments utilized by the Fund may also reference LIBOR. In July 2017, the head of the United Kingdom Financial Conduct Authority announced the desire to phase out the use of LIBOR by the end of 2021. LIBOR can no longer be used to calculate new deals as of December 31, 2021. Since December 31, 2021, all sterling, euro, Swiss franc and Japanese yen LIBOR settings and the 1-week and 2-month U.S. dollar LIBOR settings have ceased to be published or are no longer representative. Overnight and 12-month US dollar LIBOR settings permanently ceased as of June 30, 2023. 1-, 3-, and 6-month U.S. dollar LIBOR settings will continue to be published using a synthetic methodology until September 2024. Various financial industry groups have begun planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate. Neither the effect of the LIBOR transition process nor its ultimate success can yet be known. As an alternative to LIBOR, the Financial Reporting Council, in conjunction with the Alternative Reference Rates Committee, a steering committee comprised of large U.S. financial institutions recommended replacing U.S. dollar LIBOR with the Secured Overnight Financing Rate (“SOFR”), a new index calculated by reference to short-term repurchase agreements, backed by Treasury securities. Abandonment of, or modifications to, LIBOR could have adverse impacts on newly issued financial instruments and any of our existing financial instruments which reference LIBOR. Given the inherent differences between LIBOR and SOFR, or any other alternative benchmark rate that may be established, there are many uncertainties regarding a transition from LIBOR, including, but not limited to, the need to amend all contracts with LIBOR as the referenced rate and how this will impact the cost of variable rate debt and certain derivative financial instruments. In addition, SOFR or other replacement rates may fail to gain market acceptance. Any failure of SOFR or alternative reference rates to gain market acceptance could adversely affect the return on, value of and market for securities linked to such rates. Neither the effect of the LIBOR transition process nor its ultimate success can yet be known. The transition process might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of, new hedges placed against, instruments whose terms currently include LIBOR. While some existing LIBOR-based instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate-setting methodology, there may be significant uncertainty regarding the effectiveness of any such alternative methodologies to replicate LIBOR. Not all existing LIBOR-based instruments may have alternative rate-setting provisions and there remains uncertainty regarding the willingness and ability of issuers to add alternative rate-setting provisions in certain existing instruments. Moreover, these alternative rate-setting provisions may not be designed for regular use in an environment where LIBOR ceases to be published, and may be an ineffective fallback following the discontinuation of LIBOR. On March 15, 2022, President Biden signed into law the Consolidated Appropriations Act of 2022, which among other things, provides for the use of interest rates based on SOFR in certain contracts currently based on LIBOR and a safe harbor from liability for utilizing SOFR-based interest rates as a replacement for LIBOR. The elimination of LIBOR could have an adverse impact on the market value of and/or transferability of any LIBOR-linked securities, loans, and other financial obligations or extensions of credit held by or due to us or on our overall financial condition or results of operations. | ||||||||||||||||||
| Legislation Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Legislation Risk At any time after the date of this Annual Report, legislation may be enacted that could negatively affect the assets of the Fund. Legislation or regulation may change the way in which the Fund itself is regulated. The Investment Adviser cannot predict the effects of any new governmental regulation that may be implemented and there can be no assurance that any new governmental regulation will not adversely affect the Fund’s ability to achieve its investment objective. | ||||||||||||||||||
| Reliance On Service Providers Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Reliance on Service Providers Risk The Fund must rely upon the performance of service providers to perform certain functions, which may include functions that are integral to the Fund’s operations and financial performance. Failure by any service provider to carry out its obligations to the Fund in accordance with the terms of its appointment, to exercise due care and skill or to perform its obligations to the Fund at all as a result of insolvency, bankruptcy or other causes could have a material adverse effect on the Fund’s performance and returns to shareholders. The termination of the Fund’s relationship with any service provider, or any delay in appointing a replacement for such service provider, could materially disrupt the business of the Fund and could have a material adverse effect on the Fund’s performance and returns to shareholders. | ||||||||||||||||||
| Cyber Security Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Cyber Security Risk The Fund and its service providers are susceptible to cyber security risks that include, among other things, theft, unauthorized monitoring, release, misuse, loss, destruction or corruption of confidential and highly restricted data; denial of service attacks; unauthorized access to relevant systems, compromises to networks or devices that the Fund and its service providers use to service the Fund’s operations; or operational disruption or failures in the physical infrastructure or operating systems that support the Fund and its service providers. Cyber attacks are becoming increasingly common and more sophisticated, and may be perpetrated by computer hackers, cyber-terrorists or others engaged in corporate espionage. Cyber attacks against or security breakdowns of the Fund or its service providers may adversely impact the Fund and its stockholders, potentially resulting in, among other things, financial losses; the inability of Fund stockholders to transact business and the Fund to process transactions; inability to calculate the Fund’s net asset value; violations of applicable privacy and other laws; regulatory fines, penalties, reputational damage, reimbursement or other compensation costs; and/or additional compliance costs. The Fund may incur additional costs for cyber security risk management and remediation purposes. In addition, cyber security risks may also impact issuers of securities in which the Fund invests, which may cause the Fund’s investment in such issuers to lose value. There have been a number of recent highly publicized cases of companies reporting the unauthorized disclosure of client or customer information, as well as cyberattacks involving the dissemination, theft and destruction of corporate information or other assets, as a result of failure to follow procedures by employees or contractors or as a result of actions by third parties, including actions by terrorist organizations and hostile foreign governments. Although service providers typically have policies and procedures, business continuity plans and/or risk management systems intended to identify and mitigate cyber incidents, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified. Furthermore, the Fund cannot control the cyber security policies, plans and systems put in place by its service providers or any other third parties whose operations may affect the Fund or its shareholders. There can be no assurance that the Fund or its service providers will not suffer losses relating to cyber attacks or other information security breaches in the future. Because technology is consistently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a chance that some risks have not been identified or prepared for, or that an attack may not be detected, which puts limitations on the Fund’s ability to plan for or respond to a cyber attack. In addition to deliberate cyber attacks, unintentional cyber incidents can occur, such as the inadvertent release of confidential information by the Fund or its service providers. Like other funds and business enterprises, the Fund and its service providers are subject to the risk of cyber incidents occurring from time to time. | ||||||||||||||||||
| Misconduct Of Employees And Of Service Providers Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Misconduct of Employees and of Service Providers Risk Misconduct or misrepresentations by employees of the Investment Adviser or the Fund’s service providers could cause significant losses to the Fund. Employee misconduct may include binding the Fund to transactions that exceed authorized limits or present unacceptable risks and unauthorized trading activities, concealing unsuccessful trading activities (which, in any case, may result in unknown and unmanaged risks or losses) or making misrepresentations regarding any of the foregoing. Losses could also result from actions by the Fund’s service providers, including, without limitation, failing to recognize trades and misappropriating assets. In addition, employees and service providers may improperly use or disclose confidential information, which could result in litigation or serious financial harm, including limiting the Fund’s business prospects or future marketing activities. Despite the Investment Adviser’s due diligence efforts, misconduct and intentional misrepresentations may be undetected or not fully comprehended, thereby potentially undermining the Investment Adviser’s due diligence efforts. As a result, no assurances can be given that the due diligence performed by the Investment Adviser will identify or prevent any such misconduct. | ||||||||||||||||||
| Portfolio Turnover Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Portfolio Turnover Risk The Fund’s annual portfolio turnover rate may vary greatly from year to year, as well as within a given year. Portfolio turnover rate is not considered a limiting factor in the execution of investment decisions for the Fund. A higher portfolio turnover rate results in correspondingly greater brokerage commissions and other transactional expenses that are borne by the Fund. High portfolio turnover may result in an increased realization of net short-term capital gains by the Fund which, when distributed to common shareholders, will be taxable as ordinary income. Additionally, in a declining market, portfolio turnover may create realized capital losses. | ||||||||||||||||||
| Legal Tax And Regulatory Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Legal, Tax and Regulatory Risk Legal, tax and regulatory changes could occur that may have material adverse effects on the Fund or its shareholders. For example, the regulatory and tax environment for derivative instruments in which the Fund may participate is evolving, and such changes in the regulation or taxation of derivative instruments may have material adverse effects on the value of derivative instruments held by the Fund and the ability of the Fund to pursue its investment strategies. Similarly, the Biden administration has indicated that it intends to modify key aspects of the Code, including by increasing corporate and individual tax rates. Changes to the U.S. federal tax laws and interpretations thereof could adversely affect an investment in the Fund. We cannot assure you what percentage of the distributions paid on the Fund’s shares, if any, will consist of tax-advantaged qualified dividend income or long-term capital gains or what the tax rates on various types of income will be in future years. To qualify for the favorable U.S. federal income tax treatment generally accorded to RICs under the Code, the Fund must, among other things, meet certain asset diversification tests, derive in each taxable year at least 90% of its gross income from certain prescribed sources and distribute for each taxable year at least 90% of its “investment company taxable income.” Statutory limitations on distributions on the common shares if the Fund fails to satisfy the 1940 Act’s asset coverage requirements could jeopardize the Fund’s ability to meet such distribution requirements. While the Fund presently intends to purchase or redeem notes or preferred shares, if any, to the extent necessary in order to maintain compliance with such asset coverage requirements, there can be no assurance that such actions can be effected in time to meet the Code requirements. If for any taxable year the Fund does not qualify as a RIC, all of its taxable income for that year (including its net capital gain) would be subject to tax at regular corporate rates without any deduction for distributions to shareholders, and such distributions would be taxable as ordinary dividends to the extent of the Fund’s current and accumulated earnings and profits. The resulting corporate taxes would materially reduce the Fund’s net assets and the amount of cash available for distribution to shareholders. For a more complete discussion of these and other U.S. federal income tax considerations. | ||||||||||||||||||
| Investment Dilution Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Investment Dilution Risk The Fund’s investors do not have preemptive rights to any shares the Fund may issue in the future. The Fund’s Agreement and Declaration of Trust authorizes it to issue an unlimited number of shares. The Board may make certain amendments to the Agreement and Declaration of Trust. After an investor purchases shares, the Fund may sell additional shares or other classes of shares in the future or issue equity interests in private offerings. To the extent the Fund issues additional equity interests after an investor purchases its shares, such investor’s percentage ownership interest in the Fund will be diluted. | ||||||||||||||||||
| Anti Takeover Provisions [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Anti-Takeover Provisions The Fund’s Governing Documents include provisions that could limit the ability of other entities or persons to acquire control of the Fund or convert the Fund to an open-end fund. See also – “Delaware Statutory Trust Act – Control Share Acquisitions.” | ||||||||||||||||||
| Investment Restrictions [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Investment Restrictions The Fund has adopted certain fundamental investment policies designed to limit investment risk and maintain portfolio diversification. Under the 1940 Act, a fundamental policy may not be changed without the vote of a majority, as defined in the 1940 Act, of the outstanding voting securities of the Fund (voting together as a single class subject to class approval rights of any preferred shares). Should the Fund decide to issue additional series of preferred shares in the future, it may become subject to rating agency guidelines that are more limiting than its fundamental investment policies in order to obtain and maintain a desired rating on its preferred shares. | ||||||||||||||||||
| Special Risksto Holders Of Preferred Shares [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks to Holders of Preferred Shares Illiquidity Prior to Exchange Listing Market Price Fluctuation | ||||||||||||||||||
| Special Risksto Holders Of Notes [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks to Holders of Notes An investment in our notes is subject to special risks. Our notes are not likely to be listed on an exchange or automated quotation system. We cannot assure you that any market will exist for our notes or if a market does exist, whether it will provide holders with liquidity. Broker-dealers that maintain a secondary trading market for the notes are not required to maintain this market, and the Fund is not required to redeem notes if an attempted secondary market sale fails because of a lack of buyers. To the extent that our notes trade, they may trade at a price either higher or lower than their principal amount depending on interest rates, the rating (if any) on such notes and other factors. | ||||||||||||||||||
| Special Risks Of Notesto Holders Of Preferred Shares [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks of Notes to Holders of Preferred Shares As provided in the 1940 Act, and subject to compliance with the Fund’s investment limitations, the Fund may issue notes. In the event the Fund were to issue such securities, the Fund’s obligations to pay dividends or make distributions and, upon liquidation of the Fund, liquidation payments in respect of its preferred shares would be subordinate to the Fund’s obligations to make any principal and interest payments due and owing with respect to its outstanding notes. Accordingly, the Fund’s issuance of notes would have the effect of creating special risks for the Fund’s preferred shareholders that would not be present in a capital structure that did not include such securities. | ||||||||||||||||||
| Special Risksto Holders Of Notes And Preferred Shares [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risks to Holders of Notes and Preferred Shares Common Share Repurchases Common Share Distribution Policy For the fiscal year ended December 31, 2023, the Fund made distributions of $0.36 per common share, a portion of which constituted a return of capital. The composition of each distribution is estimated based on earnings as of the record date for the distribution. The actual composition of each distribution may change based on the Fund’s investment activity through the end of the calendar year. Credit Quality Ratings These guidelines could affect portfolio decisions and may be more stringent than those imposed by the 1940 Act. A rating (if any) by a rating agency does not eliminate or necessarily mitigate the risks of investing in our preferred shares or notes, and a rating may not fully or accurately reflect all of the securities’ credit risks. A rating (if any) does not address liquidity or any other market risks of the securities being rated. A rating agency could downgrade the rating of our notes or preferred shares, which may make such securities less liquid in the secondary market. If a rating agency downgrades the rating assigned to notes or preferred shares, we may alter our portfolio or redeem the preferred securities or notes under certain circumstances. | ||||||||||||||||||
| Special Risksto Holders Of Subscription Rights [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Special Risk to Holders of Subscription Rights There is a risk that changes in market conditions may result in the underlying common or preferred shares purchasable upon exercise of the subscription rights being less attractive to investors at the conclusion of the subscription period. This may reduce or eliminate the value of the subscription rights. Investors who receive subscription rights may find that there is no market to sell rights they do not wish to exercise. If investors exercise only a portion of the rights, the number of common or preferred shares issued may be reduced, and the common or preferred shares may trade at less favorable prices than larger offerings for similar securities. | ||||||||||||||||||
| Regulated Investment Company Status Risk [Member] | |||||||||||||||||||
| General Description of Registrant [Abstract] | |||||||||||||||||||
| Risk [Text Block] | Regulated Investment Company Status Risk Securities issued by certain issuers in which the Fund invests which are or become pass-through entities (such as Canadian Royalty Trusts, which may be grantor trusts for U.S. federal income tax purposes) may not produce “qualified” income for purposes of determining the Fund’s compliance with the tax rules applicable to regulated investment companies. To the extent that the Fund holds such securities indirectly through investments in a taxable subsidiary formed by the Fund, those securities may produce “qualified” income. However, the net return to the Fund on such investments would be reduced to the extent that the subsidiary is subject to corporate income taxes. The Fund intends to monitor its investments with the objective of maintaining its continued qualification as a RIC. If for any taxable year the Fund does not qualify as a RIC, all of its taxable income will be subject to tax at regular corporate rates without any deduction for distributions to shareholders, and such distributions will be taxable to the shareholders as ordinary dividends to the extent of the Fund’s current or accumulated earnings and profits. | ||||||||||||||||||