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Summary of Per Share Information
 3 Months Ended
Jun. 30, 2011
Summary of Per Share Information [Abstract]  
Summary of Per Share Information
8.           SUMMARY OF PER SHARE INFORMATION

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

   
Three Months Ended
June 30,
 
Per Share Data
 
2011
  
2010
 
Investment income
 $.32  $.79 
Operating expenses
  (.31)  (.26)
Income taxes
  (.01)  (.01)
Net investment income
  .00   .52 
Distributions from undistributed net investment income
  (.40)  (.40)
 
Net realized gain  net of tax
  (1.58)  19.78 
Net increase (decrease) in unrealized appreciation of investments
  (1.21)  (17.57)
Stock option expense
  .07   .06 
 
Increase (decrease) in net asset value
  (3.12)  2.39 
Net asset value
        
Beginning of period
  143.68   130.14 
End of period
 $140.56  $132.53