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SUMMARY OF PER SHARE INFORMATION (Details) (USD $)
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
SUMMARY OF PER SHARE INFORMATION [Abstract]    
Investment income (in dollars per share) $ 0.38 $ 0.32
Operating expenses per share (in dollars per share) $ (0.37) $ (0.31)
Income taxes (in dollars per share) $ (0.01) $ (0.01)
Net investment income (in dollars per share) $ 0.00 $ 0.00
Distributions from undistributed net investment income (in dollars per share) $ (0.4) $ (0.4)
Net realized gain net of tax (in dollars per share) $ 17.61 $ (1.58)
Net increase (decrease) in unrealized appreciation of investments (in dollars per share) $ (20.67) $ (1.21)
Distribution from Undistributed net realized gains (in dollars per share) $ (17.59) $ 0
Capital Share transactions:    
Exercise of employee stock options (in dollars per share) $ (0.74) $ 0
Stock option expense (in dollars per share) $ 0.07 $ 0.07
Decrease in net asset value (in dollars per share) $ (21.72) $ (3.12)
Net asset value per share $ 167.45 $ 143.68
Net asset value per share $ 145.73 $ 140.56