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SUMMARY OF PER SHARE INFORMATION (Tables) | 9 Months Ended
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Dec. 31, 2012
SUMMARY OF PER SHARE INFORMATION [Abstract] |
Summary of per share data | The following presents a summary of per share data for the three and nine months ended December 31, 2012 and 2011.
|  | Three Months Ended December 31 |  |  | Nine Months Ended December 31 |
Per Share Data |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Investment income |  | $ | 1.84 |  |  | $ | 1.50 |  |  | $ | 2.57 |  |  | $ | 2.15 |
Operating expenses |  |  | (.74 | ) |  |  | (.32 | ) |  |  | (1.50 | ) |  |  | (.96 | )
Income taxes |  |  | (.01 | ) |  |  | (.01 | ) |  |  | (.01 | ) |  |  | (.01 | )
Net investment income |  |  | 1.09 |  |  |  | 1.17 |  |  |  | 1.06 |  |  |  | 1.18 |
Distributions from undistributed net investment income |  |  | (.40 | ) |  |  | (.40 | ) |  |  | (.80 | ) |  |  | (.80 | )
Net realized gain/(loss) net of tax |  |  | .17 |  |  |  | (.64 | ) |  |  | 17.78 |  |  |  | 2.68 |
Net increase (decrease) in unrealized appreciation of investments |  |  | 5.87 |  |  |  | 13.00 |  |  |  | (1.56 | ) |  |  | .04 |
Dividends from capital gains |  |  | – |  |  |  |  |  |  |  | (17.59 | ) |  |  |  |
Exercise of employee stock options |  |  | (.04 | ) |  |  | – |  |  |  | (.76 | ) |  |  | (.03 | )
Stock option expense |  |  | .02 |  |  |  | .07 |  |  |  | .09 |  |  |  | .20 |
Other* |  |  | – |  |  |  | – |  |  |  | (.31 | ) |  |  | – |
Increase (decrease) in net asset value |  |  | 6.71 |  |  |  | 13.20 |  |  |  | (2.09 | ) |  |  | 3.27 |
Net asset value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period |  |  | 158.65 |  |  |  | 133.75 |  |  |  | 167.45 |  |  |  | 143.68 |
End of period |  | $ | 165.36 |  |  | $ | 146.95 |  |  | $ | 165.36 |  |  | $ | 146.95 |
* | Reflects impact of the different share amounts as a result of issuance or forfeiture of restricted stock during the period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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