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SELECTED QUARTERLY FINANCIAL DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
SELECTED QUARTERLY FINANCIAL DATA [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net investment income (loss) | $ (2,133) | $ 4,142 | $ (120) | $ 18 | $ (1,878) | $ 4,385 | $ 23 | $ 14 | $ 1,907 | $ 2,544 | $ 1,804
Net realized gain (loss) on investments | 20,912 | 640 | (7) | 66,888 | 349 | (2,360) | 18,500 | (5,911) | 88,433 | 10,578 | 38,885
Net increase (decrease) in unrealized appreciation of investments | 22,271 | 22,296 | 50,321 | (78,521) | 78,501 | 48,798 | (44,076) | (4,588) | 16,367 | 78,635 | 12,999
Increase in net assets from operations | $ 41,050 | $ 27,078 | $ 50,194 | $ (11,615) | $ 77,092 | $ 50,823 | $ (25,703) | $ (10,455) | $ 106,707 | $ 91,757 | $ 53,688
Net increase (decrease) in net operations per share (in dollars per share) | $ 10.77 | $ 7.11 | $ 13.18 | $ (3.05) | $ 20.53 | $ 13.53 | $ (6.85) | $ (2.79) | $ 28.01 | $ 24.42 |

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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