Common Stocks [Member] Series A Cumulative Preferred Stock [Member] Series B Cumulative Preferred Stock [Member] Series E Cumulative Preferred Stock [Member] Cumulative Preferred Stocks [Member] Purchase Transaction [Member] Sale Transaction [Member] Dividends On Preferred Shares Not Included [Member] Market Risk [Member] Interest Rate Risk Generally [Member] Inflation Risk [Member] Convertible Securities Risk [Member] Equity Risk [Member] Common Stock Risk [Member] Distribution Risk For Equity Income Securities [Member] Preferred Stock Risk [Member] Significant Holdings Risk [Member] Small Capitalization Company Risk [Member] Value Investing Risk [Member] Selection Risk [Member] Merger Arbitrage Risk [Member] Recapitalization Risk [Member] Fixed Income Securities Risks [Member] Corporate Bonds Risk [Member] Non Investment Grade Securities Risk [Member] U S Government Securities And Credit Rating Downgrade Risk [Member] Prepayment Risks On Government Sponsored Mortgage Backed Securities [Member] Foreign Securities Risk [Member] Restricted And Illiquid Securities [Member] Special Risks Related To Investment In Derivatives [Member] Derivatives Regulation Risk [Member] Short Sales Risk [Member] Industry Risk [Member] Food And Beverage Sector Risk [Member] Leverage Risk [Member] Market Discount Risk [Member] Long Term Objective Not Complete Investment Program [Member] Management Risk [Member] Decision Making Authority Risk [Member] Dependence On Key Personnel [Member] Market Disruption And Geopolitical Risk [Member] Economic Events And Market Risk [Member] Regulation And Government Intervention Risk [Member] S O F R Risk [Member] Deflation Risk [Member] Legislation Risk [Member] Reliance On Service Providers Risk [Member] Cyber Security Risk [Member] Misconduct Of Employees And Of Service Providers Risk [Member] Loans Of Portfolio Securities [Member] Legal Tax And Regulatory Risk [Member] Investment Dilution Risk [Member] Act Regulation 1940 [Member] Anti Takeover Provisions [Member] Special Risks To Holders Of Notes [Member] Special Risks To Holders Of Fixed Rate Preferred Shares [Member] Special Risks To Holders Of Notes And Preferred Shares [Member] Special Risks Of Notes To Holders Of Preferred Shares [Member] Special Risks To Holders Of Common Shares [Member] Special Risk To Holders Of Subscription Rights [Member] Additional Investment Policies [Member] Additional Risks Relating To Derivative Investments [Member]