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CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Investments at market or fair value    
Companies more than 25% owned, Cost $ 14,870 $ 25,521
Companies 5% to 25% owned, Cost 14,003 14,049
Companies less than 5% owned, Cost 60,120 58,784
Total investments, Cost $ 88,993 $ 98,354
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) 4,339,416 4,337,916
Treasury stock, at cost (in shares) 584,878 584,878
Net asset value per share (in shares) 3,754,538 3,753,038