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SUMMARY OF PER SHARE INFORMATION
6 Months Ended
Sep. 30, 2011
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] 
SUMMARY OF PER SHARE INFORMATION
8. 
SUMMARY OF PER SHARE INFORMATION

The following presents a summary of per share data for the six and three months ended September 30, 2011 and 2010.

   
Three Months Ended
September 30,
  
Six Months Ended
September 30
 
Per Share Data
 
2011
  
2010
  
2011
  
2010
 
Investment income
 $.34  $.31  $.65  $1.10 
Operating expenses
  (.32)  (.28)  (.63)  (.54)
Income taxes
  (.01)  (.01)  (.01)  (.01)
Net investment income
  .01   .02   .01   .55 
Distributions from undistributed net investment income
        (.40)  (.40)
Net realized gain  net of tax
  4.88   .14   3.31   19.92 
Net increase (decrease) in unrealized appreciation of investments
  (11.74)  6.24   (12.95)  (11.32)
Exercise of employee stock options
  (.03)  (.01)  (.03)  (.01)
Stock option expense
  .07   .07   .13   .11 
Increase (decrease) in net asset value
  (6.81)  6.46   (9.93)  8.85 
Net asset value
                
Beginning of period
  140.56   132.53   143.68   130.14 
End of period
 $133.75  $138.99  $133.75  $138.99