First Trust Specialty Finance and Financial Opportunities Fund (FGB) N-CSRS 7 Aug 23 Certified semi-annual shareholder report (management investment company) Financial data

N-2

N-2	6 Months Ended
	May 31, 2023 $ / shares shares
Cover [Abstract]
Entity Central Index Key	0001392994
Amendment Flag	false
Entity Inv Company Type	N-2
Document Type	N-CSRS
Entity Registrant Name	First Trust Specialty Finance and Financial Opportunities Fund
General Description of Registrant [Abstract]
Investment Objectives and Practices [Text Block]	The primary investment objective of the Fund is to seek a high level of current income. As a secondary objective, the Fund seeks an attractive total return. The Fund pursues its investment objectives by investing, under normal market conditions, at least 80% of its Managed Assets in a portfolio of securities of specialty finance and other financial companies that Confluence Investment Management LLC (“Confluence” or the “Sub-Advisor”) believes offer attractive opportunities for income and capital appreciation. Under normal market conditions, the Fund concentrates its investments in securities of companies within industries in the financial sector. “Managed Assets” means the total asset value of the Fund minus the sum of its liabilities, other than the principal amount of borrowings. There can be no assurance that the Fund will achieve its investment objectives. The Fund may not be appropriate for all investors.
Risk Factors [Table Text Block]	Principal Risks The Fund is a closed-end management investment company designed primarily as a long-term investment and not as a trading vehicle. The Fund is not intended to be a complete investment program and, due to the uncertainty inherent in all investments, there can be no assurance that the Fund will achieve its investment objectives. The following discussion summarizes the principal risks associated with investing in the Fund, which includes the risk that you could lose some or all of your investment in the Fund. The Fund is subject to the informational requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940 and, in accordance therewith, files reports, proxy statements and other information that is available for review. Business Development Company (“BDC”) Risk . The Fund invests in closed-end funds that have elected to be treated as BDCs. Investments in BDCs may be subject to a high degree of risk. BDCs typically invest in small and medium-sized private and certain public companies that may not have access to public equity markets or capital raising, and investments in these companies present a greater risk of loss due to the companies’ youth and limited track record. BDCs are also generally more susceptible to competition and economic and market changes due to limited products and market shares. A BDC’s portfolio could include a substantial amount of securities purchased in private placements, and its portfolio may carry risks similar to those of a private equity or venture capital fund. Securities that are not publicly registered may be difficult to value and may be difficult to sell at a price representative of their intrinsic value. Investments in BDCs are subject to various risks, including management’s ability to meet the BDC’s investment objective, and to manage the BDC’s portfolio when the underlying securities are redeemed or sold, during periods of market turmoil and as investors’ perceptions regarding a BDC or its underlying investments change. Certain BDCs in which the Fund invests employ the use of leverage in their portfolios through borrowings or in the issuance of preferred stock. While leverage often serves to increase the yield of a BDC, the leverage also subjects the BDC to increased risks, including the likelihood of increased volatility and the possibility that the BDC’s common share income will fall if the dividend rate on any preferred shares or the interest rate on any borrowings rises. In addition, the market price for BDCs, together with other dividend paying stocks, may be negatively affected by a rise in interest rates. Alternatively, declining interest rates could adversely impact the earnings of BDCs in which the Fund invests, as new loan originations would likely be made at lower yields. BDC shares are not redeemable at the option of the BDC shareholder and, as with shares of other closed-end funds, they may trade in the secondary market at a discount to their NAV. Cyber Security Risk . The Fund is susceptible to potential operational risks through breaches in cyber security. A breach in cyber security refers to both intentional and unintentional events that may cause the Fund to lose proprietary information, suffer data corruption or lose operational capacity. Such events could cause the Fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss. Cyber security breaches may involve unauthorized access to the Fund’s digital information systems through “hacking” or malicious software coding, but may also result from outside attacks such as denial-of-service attacks through efforts to make network services unavailable to intended users. In addition, cyber security breaches of the Fund’s third-party service providers, such as its administrator, transfer agent, custodian, or sub-advisor, as applicable, or issuers in which the Fund invests, can also subject the Fund to many of the same risks associated with direct cyber security breaches. The Fund has established risk management systems designed to reduce the risks associated with cyber security. However, there is no guarantee that such efforts will succeed, especially because the Fund does not directly control the cyber security systems of issuers or third party service providers. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future. Financial Sector Concentration Risk . Under normal market conditions, the Fund concentrates its investments (i.e., invests at least 25% of its total assets) in securities of companies within industries in the financial sector. A fund concentrated in a single industry or sector is likely to present more risks than a fund that is broadly diversified over several industries or groups of industries. Compared to the broad market, an individual sector may be more strongly affected by changes in the economic climate, broad market shifts, moves in a particular dominant stock, or regulatory changes. Specialty finance and other financial companies in general are subject to extensive government regulation, which may change frequently and may have significant adverse consequences for financial companies, including effects not intended by such regulation. The profitability of specialty finance and other financial companies is largely dependent upon the availability and cost of capital funds, and may fluctuate significantly in response to changes in interest rates, as well as changes in general economic conditions. From time to time, severe competition may also affect the profitability of specialty finance and other financial companies. Financial companies can be highly dependent upon access to capital markets and any impediments to such access, such as general economic conditions or a negative perception in the capital markets of a company’s financial condition or prospects, could adversely affect its business. The impact of more stringent capital requirements, or recent or future regulation in various countries, on any individual financial company or on financial companies as a whole cannot be predicted. Certain risks may impact the value of investments in financial companies more severely than those of investments in other issuers, including the risks associated with companies that operate with substantial financial leverage. Financial companies may also be adversely affected by volatility in interest rates, loan losses and other customer defaults, decreases in the availability of money or asset valuations, credit rating downgrades and adverse conditions in other related markets. Financial companies are also a target for cyber attacks and may experience technology malfunctions and disruptions as a result. Leasing companies may be negatively impacted by changes in tax laws which affect the types of transactions in which such companies engage. Illiquid Securities Risk . The Fund may invest in securities that are considered to be illiquid securities. Illiquid securities may be difficult to dispose of at a fair price at the times when the Fund believes it is desirable to do so. The market price of illiquid securities generally is more volatile than that of more liquid securities, which may adversely affect the price that the Fund pays for or recovers upon the sale of such securities. Illiquid securities are also more difficult to value, especially in challenging markets. Income and Interest Rate Risk . The income common shareholders receive from the Fund is based primarily on the dividends and interest it earns from its investments, which can vary widely over the short and long-term. If prevailing market interest rates drop, distribution rates of the Fund’s portfolio holdings may decline which then may adversely affect the Fund’s distributions on its common shares as well. The Fund’s income also would likely be adversely affected when prevailing short-term interest rates increase and the Fund is utilizing leverage. Leverage Risk . The use of leverage by the Fund can magnify the effect of any losses. If the income and gains from the securities and investments purchased with leverage proceeds do not cover the cost of leverage, the return to the common shares will be less than if leverage had not been used. Leverage involves risks and special considerations for common shareholders including: (i) the likelihood of greater volatility of net asset value and market price of the common shares than a comparable portfolio without leverage; (ii) the risk that fluctuations in interest rates on borrowings will reduce the return to the common shareholders or will result in fluctuations in the dividends paid on the common shares; (iii) in a declining market, the use of leverage is likely to cause a greater decline in the net asset value of the common shares than if the Fund were not leveraged, which may result in a greater decline in the market price of the common shares; and (iv) when the Fund uses certain types of leverage, the investment advisory fee payable to the Advisor and by the Advisor to the Sub-Advisor will be higher than if the Fund did not use leverage. To the extent the Fund uses leverage and invests in BDCs that also use leverage, the risks associated with leverage will be magnified, potentially significantly. Management Risk and Reliance on Key Personnel . The implementation of the Fund’s investment strategy depends upon the continued contributions of certain key employees of the Advisor and Sub-Advisor, some of whom have unique talents and experience and would be difficult to replace. The loss or interruption of the services of a key member of the portfolio management team could have a negative impact on the Fund. Market Discount from Net Asset Value . Shares of closed-end investment companies such as the Fund frequently trade at a discount from their net asset value. The Fund cannot predict whether its common shares will trade at, below or above net asset value. Market Risk. Securities held by the Fund, as well as shares of the Fund itself, are subject to market fluctuations caused by factors such as general economic conditions, political events, regulatory or market developments, changes in interest rates and perceived trends in securities prices. Shares of the Fund could decline in value or underperform other investments as a result of the risk of loss associated with these market fluctuations. In addition, local, regional or global events such as war, acts of terrorism, spread of infectious diseases or other public health issues, recessions, or other events could have a significant negative impact on the Fund and its investments. For example, the coronavirus (COVID-19) global pandemic and the aggressive responses taken by many governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines or similar restrictions, had negative impacts, and in many cases severe impacts, on markets worldwide. While the development of vaccines has slowed the spread of the virus and allowed for the resumption of reasonably normal business activity in the United States, many countries continue to impose lockdown measures in an attempt to slow the spread. Additionally, there is no guarantee that vaccines will be effective against emerging variants of the disease. Also, in February 2022, Russia invaded Ukraine which has caused and could continue to cause significant market disruptions and volatility within the markets in Russia, Europe and the United States. These hostilities and sanctions resulting from these hostilities could have a significant impact on certain Fund investments as well as Fund performance. As the global pandemic and conflict in Ukraine have illustrated such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Recent and potential future bank failures could result in disruption to the broader banking industry or markets generally and reduce confidence in financial institutions and the economy as a whole, which may also heighten market volatility and reduce liquidity. These events also may adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. Any of such circumstances could have a materially negative impact on the value of the Fund’s shares and result in increased market volatility. During any such events, the Fund’s shares may trade at increased premiums or discounts to their net asset value and the bid/ask spread on the Fund’s shares may widen. Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund and the Advisor seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks. Potential Conflicts of Interest Risk . First Trust, Confluence and the portfolio managers have interests which may conflict with the interests of the Fund. In particular, First Trust and Confluence currently manage and may in the future manage and/or advise other investment funds or accounts with the same or substantially similar investment objective and strategies as the Fund. In addition, while the Fund is using leverage, the amount of the fees paid to First Trust (and by First Trust to Confluence) for investment advisory and management services are higher than if the Fund did not use leverage because the fees paid are calculated based on managed assets. Therefore, First Trust and Confluence have a financial incentive to leverage the Fund. REIT, Mortgage-Related and Asset-Backed Securities Risk . Investing in REITs involves certain unique risks in addition to investing in the real estate industry in general. REITs are subject to interest rate risk (especially mortgage REITs) and the risk of default by lessees or borrowers. An equity REIT may be affected by changes in the value of the underlying properties owned by the REIT. A mortgage REIT may be affected by the ability of the issuers of its portfolio of mortgages to repay their obligations. REITs whose underlying assets are concentrated in properties used by a particular industry are also subject to risks associated with such industry. REITs may have limited diversification due to investment in a limited number of properties or a particular market segment and are subject to the risks associated with obtaining financing for real property. REITs may have limited financial resources, their securities may trade less frequently and in a limited volume, and their securities may be subject to more abrupt or erratic price movements than larger company securities. Additionally, certain REITs charge management fees, which may result in layering of management fees paid by the Fund. In addition to REITs, the Fund may invest in a variety of other mortgage-related securities, including commercial mortgage securities and other mortgage-backed instruments. Mortgage-related securities are susceptible to adverse economic, political or regulatory events that affect the value of real estate. Mortgage-related securities are also significantly affected by other factors such as borrower defaults, delinquencies, realized or liquidation losses and other shortfalls. Rising interest rates tend to extend the duration of mortgage-related securities, making them more sensitive to changes in interest rates, and may reduce the market value of the securities. In addition, mortgage-related securities are subject to prepayment risk, the risk that borrowers may pay off their mortgages sooner than expected, particularly when interest rates decline. This can reduce the Fund’s returns because the Fund may have to reinvest that money at lower prevailing interest rates. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-backed securities, as well as additional risks associated with the nature of the assets and the servicing of those assets. In general, mortgage-related securities and asset-backed securities are subject to credit risk, extension risk, interest rate risk, liquidity risk and valuation risk. Specialty Finance and Other Financial Companies Risks . The profitability of specialty finance and other financial companies in which the Fund may invest is largely dependent upon the availability and cost of capital, and may fluctuate significantly in response to changes in interest rates, as well as changes in general economic conditions. Any impediments to a specialty finance or other financial company’s access to capital markets, such as those caused by general economic conditions or a negative perception in the capital markets or the company’s financial condition or prospects, could adversely affect such company’s business. From time to time, severe competition may also affect the profitability of specialty finance and other financial companies. Specialty finance and other financial companies are subject to rapid business changes, significant competition, value fluctuations due to the concentration of loans in particular industries significantly affected by economic conditions (such as real estate or energy) and volatile performance based upon the availability and cost of capital and prevailing interest rates. In addition, credit and other losses resulting from the financial difficulties of borrowers or other third parties potentially may have an adverse effect on companies in these industries. Valuation Risk . The valuation of the Fund’s investments may carry more risk than that of traditional common stock. Uncertainties in the conditions of the financial market, unreliable reference data, lack of transparency and inconsistency of valuation models and processes may lead to inaccurate asset pricing.
Share Price	$ 2.95
NAV Per Share	$ 3.51
Capital Stock, Long-Term Debt, and Other Securities [Abstract]
Outstanding Security, Title [Text Block]	Common Shares outstanding (unlimited number of Common Shares has been authorized)
Outstanding Security, Held [Shares] | shares	14,367,591
Business Development Company B D C Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Business Development Company (“BDC”) Risk . The Fund invests in closed-end funds that have elected to be treated as BDCs. Investments in BDCs may be subject to a high degree of risk. BDCs typically invest in small and medium-sized private and certain public companies that may not have access to public equity markets or capital raising, and investments in these companies present a greater risk of loss due to the companies’ youth and limited track record. BDCs are also generally more susceptible to competition and economic and market changes due to limited products and market shares. A BDC’s portfolio could include a substantial amount of securities purchased in private placements, and its portfolio may carry risks similar to those of a private equity or venture capital fund. Securities that are not publicly registered may be difficult to value and may be difficult to sell at a price representative of their intrinsic value. Investments in BDCs are subject to various risks, including management’s ability to meet the BDC’s investment objective, and to manage the BDC’s portfolio when the underlying securities are redeemed or sold, during periods of market turmoil and as investors’ perceptions regarding a BDC or its underlying investments change. Certain BDCs in which the Fund invests employ the use of leverage in their portfolios through borrowings or in the issuance of preferred stock. While leverage often serves to increase the yield of a BDC, the leverage also subjects the BDC to increased risks, including the likelihood of increased volatility and the possibility that the BDC’s common share income will fall if the dividend rate on any preferred shares or the interest rate on any borrowings rises. In addition, the market price for BDCs, together with other dividend paying stocks, may be negatively affected by a rise in interest rates. Alternatively, declining interest rates could adversely impact the earnings of BDCs in which the Fund invests, as new loan originations would likely be made at lower yields. BDC shares are not redeemable at the option of the BDC shareholder and, as with shares of other closed-end funds, they may trade in the secondary market at a discount to their NAV.
Cyber Security Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Cyber Security Risk . The Fund is susceptible to potential operational risks through breaches in cyber security. A breach in cyber security refers to both intentional and unintentional events that may cause the Fund to lose proprietary information, suffer data corruption or lose operational capacity. Such events could cause the Fund to incur regulatory penalties, reputational damage, additional compliance costs associated with corrective measures and/or financial loss. Cyber security breaches may involve unauthorized access to the Fund’s digital information systems through “hacking” or malicious software coding, but may also result from outside attacks such as denial-of-service attacks through efforts to make network services unavailable to intended users. In addition, cyber security breaches of the Fund’s third-party service providers, such as its administrator, transfer agent, custodian, or sub-advisor, as applicable, or issuers in which the Fund invests, can also subject the Fund to many of the same risks associated with direct cyber security breaches. The Fund has established risk management systems designed to reduce the risks associated with cyber security. However, there is no guarantee that such efforts will succeed, especially because the Fund does not directly control the cyber security systems of issuers or third party service providers. Substantial costs may be incurred by the Fund in order to resolve or prevent cyber incidents in the future.
Financial Sector Concentration Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Financial Sector Concentration Risk . Under normal market conditions, the Fund concentrates its investments (i.e., invests at least 25% of its total assets) in securities of companies within industries in the financial sector. A fund concentrated in a single industry or sector is likely to present more risks than a fund that is broadly diversified over several industries or groups of industries. Compared to the broad market, an individual sector may be more strongly affected by changes in the economic climate, broad market shifts, moves in a particular dominant stock, or regulatory changes. Specialty finance and other financial companies in general are subject to extensive government regulation, which may change frequently and may have significant adverse consequences for financial companies, including effects not intended by such regulation. The profitability of specialty finance and other financial companies is largely dependent upon the availability and cost of capital funds, and may fluctuate significantly in response to changes in interest rates, as well as changes in general economic conditions. From time to time, severe competition may also affect the profitability of specialty finance and other financial companies. Financial companies can be highly dependent upon access to capital markets and any impediments to such access, such as general economic conditions or a negative perception in the capital markets of a company’s financial condition or prospects, could adversely affect its business. The impact of more stringent capital requirements, or recent or future regulation in various countries, on any individual financial company or on financial companies as a whole cannot be predicted. Certain risks may impact the value of investments in financial companies more severely than those of investments in other issuers, including the risks associated with companies that operate with substantial financial leverage. Financial companies may also be adversely affected by volatility in interest rates, loan losses and other customer defaults, decreases in the availability of money or asset valuations, credit rating downgrades and adverse conditions in other related markets. Financial companies are also a target for cyber attacks and may experience technology malfunctions and disruptions as a result. Leasing companies may be negatively impacted by changes in tax laws which affect the types of transactions in which such companies engage.
Illiquid Securities Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Illiquid Securities Risk . The Fund may invest in securities that are considered to be illiquid securities. Illiquid securities may be difficult to dispose of at a fair price at the times when the Fund believes it is desirable to do so. The market price of illiquid securities generally is more volatile than that of more liquid securities, which may adversely affect the price that the Fund pays for or recovers upon the sale of such securities. Illiquid securities are also more difficult to value, especially in challenging markets.
Income And Interest Rate Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Income and Interest Rate Risk . The income common shareholders receive from the Fund is based primarily on the dividends and interest it earns from its investments, which can vary widely over the short and long-term. If prevailing market interest rates drop, distribution rates of the Fund’s portfolio holdings may decline which then may adversely affect the Fund’s distributions on its common shares as well. The Fund’s income also would likely be adversely affected when prevailing short-term interest rates increase and the Fund is utilizing leverage.
Leverage Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Leverage Risk . The use of leverage by the Fund can magnify the effect of any losses. If the income and gains from the securities and investments purchased with leverage proceeds do not cover the cost of leverage, the return to the common shares will be less than if leverage had not been used. Leverage involves risks and special considerations for common shareholders including: (i) the likelihood of greater volatility of net asset value and market price of the common shares than a comparable portfolio without leverage; (ii) the risk that fluctuations in interest rates on borrowings will reduce the return to the common shareholders or will result in fluctuations in the dividends paid on the common shares; (iii) in a declining market, the use of leverage is likely to cause a greater decline in the net asset value of the common shares than if the Fund were not leveraged, which may result in a greater decline in the market price of the common shares; and (iv) when the Fund uses certain types of leverage, the investment advisory fee payable to the Advisor and by the Advisor to the Sub-Advisor will be higher than if the Fund did not use leverage. To the extent the Fund uses leverage and invests in BDCs that also use leverage, the risks associated with leverage will be magnified, potentially significantly.
Management Risk And Reliance On Key Personnel [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Management Risk and Reliance on Key Personnel . The implementation of the Fund’s investment strategy depends upon the continued contributions of certain key employees of the Advisor and Sub-Advisor, some of whom have unique talents and experience and would be difficult to replace. The loss or interruption of the services of a key member of the portfolio management team could have a negative impact on the Fund.
Market Discount From Net Asset Value [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Market Discount from Net Asset Value . Shares of closed-end investment companies such as the Fund frequently trade at a discount from their net asset value. The Fund cannot predict whether its common shares will trade at, below or above net asset value.
Market Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Market Risk. Securities held by the Fund, as well as shares of the Fund itself, are subject to market fluctuations caused by factors such as general economic conditions, political events, regulatory or market developments, changes in interest rates and perceived trends in securities prices. Shares of the Fund could decline in value or underperform other investments as a result of the risk of loss associated with these market fluctuations. In addition, local, regional or global events such as war, acts of terrorism, spread of infectious diseases or other public health issues, recessions, or other events could have a significant negative impact on the Fund and its investments. For example, the coronavirus (COVID-19) global pandemic and the aggressive responses taken by many governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines or similar restrictions, had negative impacts, and in many cases severe impacts, on markets worldwide. While the development of vaccines has slowed the spread of the virus and allowed for the resumption of reasonably normal business activity in the United States, many countries continue to impose lockdown measures in an attempt to slow the spread. Additionally, there is no guarantee that vaccines will be effective against emerging variants of the disease. Also, in February 2022, Russia invaded Ukraine which has caused and could continue to cause significant market disruptions and volatility within the markets in Russia, Europe and the United States. These hostilities and sanctions resulting from these hostilities could have a significant impact on certain Fund investments as well as Fund performance. As the global pandemic and conflict in Ukraine have illustrated such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Recent and potential future bank failures could result in disruption to the broader banking industry or markets generally and reduce confidence in financial institutions and the economy as a whole, which may also heighten market volatility and reduce liquidity. These events also may adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets. Any of such circumstances could have a materially negative impact on the value of the Fund’s shares and result in increased market volatility. During any such events, the Fund’s shares may trade at increased premiums or discounts to their net asset value and the bid/ask spread on the Fund’s shares may widen.
Operational Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Operational Risk. The Fund is subject to risks arising from various operational factors, including, but not limited to, human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or systems failures. The Fund relies on third parties for a range of services, including custody. Any delay or failure relating to engaging or maintaining such service providers may affect the Fund’s ability to meet its investment objective. Although the Fund and the Advisor seek to reduce these operational risks through controls and procedures, there is no way to completely protect against such risks.
Potential Conflicts Of Interest Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Potential Conflicts of Interest Risk . First Trust, Confluence and the portfolio managers have interests which may conflict with the interests of the Fund. In particular, First Trust and Confluence currently manage and may in the future manage and/or advise other investment funds or accounts with the same or substantially similar investment objective and strategies as the Fund. In addition, while the Fund is using leverage, the amount of the fees paid to First Trust (and by First Trust to Confluence) for investment advisory and management services are higher than if the Fund did not use leverage because the fees paid are calculated based on managed assets. Therefore, First Trust and Confluence have a financial incentive to leverage the Fund.
R E I T Mortgage Related And Asset Backed Securities Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	REIT, Mortgage-Related and Asset-Backed Securities Risk . Investing in REITs involves certain unique risks in addition to investing in the real estate industry in general. REITs are subject to interest rate risk (especially mortgage REITs) and the risk of default by lessees or borrowers. An equity REIT may be affected by changes in the value of the underlying properties owned by the REIT. A mortgage REIT may be affected by the ability of the issuers of its portfolio of mortgages to repay their obligations. REITs whose underlying assets are concentrated in properties used by a particular industry are also subject to risks associated with such industry. REITs may have limited diversification due to investment in a limited number of properties or a particular market segment and are subject to the risks associated with obtaining financing for real property. REITs may have limited financial resources, their securities may trade less frequently and in a limited volume, and their securities may be subject to more abrupt or erratic price movements than larger company securities. Additionally, certain REITs charge management fees, which may result in layering of management fees paid by the Fund. In addition to REITs, the Fund may invest in a variety of other mortgage-related securities, including commercial mortgage securities and other mortgage-backed instruments. Mortgage-related securities are susceptible to adverse economic, political or regulatory events that affect the value of real estate. Mortgage-related securities are also significantly affected by other factors such as borrower defaults, delinquencies, realized or liquidation losses and other shortfalls. Rising interest rates tend to extend the duration of mortgage-related securities, making them more sensitive to changes in interest rates, and may reduce the market value of the securities. In addition, mortgage-related securities are subject to prepayment risk, the risk that borrowers may pay off their mortgages sooner than expected, particularly when interest rates decline. This can reduce the Fund’s returns because the Fund may have to reinvest that money at lower prevailing interest rates. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-backed securities, as well as additional risks associated with the nature of the assets and the servicing of those assets. In general, mortgage-related securities and asset-backed securities are subject to credit risk, extension risk, interest rate risk, liquidity risk and valuation risk.
Speciality Finance And Other Financial Companies Risks [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Specialty Finance and Other Financial Companies Risks . The profitability of specialty finance and other financial companies in which the Fund may invest is largely dependent upon the availability and cost of capital, and may fluctuate significantly in response to changes in interest rates, as well as changes in general economic conditions. Any impediments to a specialty finance or other financial company’s access to capital markets, such as those caused by general economic conditions or a negative perception in the capital markets or the company’s financial condition or prospects, could adversely affect such company’s business. From time to time, severe competition may also affect the profitability of specialty finance and other financial companies. Specialty finance and other financial companies are subject to rapid business changes, significant competition, value fluctuations due to the concentration of loans in particular industries significantly affected by economic conditions (such as real estate or energy) and volatile performance based upon the availability and cost of capital and prevailing interest rates. In addition, credit and other losses resulting from the financial difficulties of borrowers or other third parties potentially may have an adverse effect on companies in these industries.
Valuation Risk [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	Valuation Risk . The valuation of the Fund’s investments may carry more risk than that of traditional common stock. Uncertainties in the conditions of the financial market, unreliable reference data, lack of transparency and inconsistency of valuation models and processes may lead to inaccurate asset pricing.