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CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2012
Mar. 31, 2012
Investments at market or fair value    
Companies more than 25% owned, Cost $ 12,678,000 $ 14,870,000
Companies 5% to 25% owned, Cost 15,594,000 14,003,000
Companies less than 5% owned, Cost 66,354,000 60,120,000
Total investments, Cost $ 94,626,397 $ 88,992,822
Net Assets    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, authorized (in shares) 5,000,000 5,000,000
Common stock, issued (in shares) 4,382,956 4,339,416
Treasury stock (in shares) 584,878 584,878
Shares outstanding (in shares) 3,798,078 3,754,538