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Consolidated Statements of Changes in Net Assets (Unaudited) (USD $)
In Thousands
3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Operations:    
Net investment income $ 14 $ 1,962
Net realized gain (loss) on investments (5,911) 74,015
Net decrease in unrealized appreciation of investments (4,558) (65,742)
Increase (Decrease) in net assets from operations (10,455) 10,235
Distributions from:    
Distributions from undistributed net investment income (1,501) (1,497)
Capital share transactions:    
Stock option expense 245 223
Increase (decrease) in net assets (11,711) 8,961
Net assets, beginning of period 539,233  
Net assets, end of period $ 527,522 $ 495,887