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SUMMARY OF PER SHARE INFORMATION
9 Months Ended
Dec. 31, 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 nine and three months ended December 31, 2011 and 2010.

   
Three Months Ended
December 31,
  
Nine Months Ended
December 31,
 
Per Share Data
 
2011
  
2010
  
2011
  
2010
 
Investment income
 $1.50  $.63  $2.15  $1.73 
Operating expenses
  (.32)  (.29)  (.96)  (.84)
Income taxes
  (.01)  (.01)  (.01)  (.02)
Net investment income
  1.17   .33   1.18   .87 
Distributions from undistributed net investment income
  (.40)  (.40)  (.80)  (.80)
Net realized gain  net of tax
  (.64)  (7.67)  2.68   12.19 
Net increase (decrease) in unrealized appreciation of investments
  13.00   5.82   .04   (5.47)
Exercise of employee stock options
     (.19)  (.03)  (.20)
Stock option expense
  .07   .06   .20   .19 
Increase (decrease) in net asset value
  13.20   (2.05)  3.27   6.78 
Net asset value
                
Beginning of period
  133.75   138.99   143.68   130.14 
End of period
 $146.95  $136.92  $146.95  $136.92