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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operations:    
Net investment income $ 18 $ 14
Net realized gain (loss) on investments 66,888 (5,911)
Net decrease in unrealized appreciation of investments (78,521) (4,558)
Decrease in net assets from operations (11,615) (10,455)
Distributions from:    
Undistributed net investment income (1,505) (1,501)
Undistributed net realized gain (66,826) 0
Capital share transactions:    
Exercise of employee stock options 3,017 0
Stock option expense 257 245
Decrease in net assets (76,672) (11,711)
Net assets, beginning of period 628,706 539,233
Net assets, end of period $ 552,034 $ 527,522