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INCOME TAXES (Details) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011
INCOME TAXES [Abstract] |  |  |  |  |
Annual distribution minimum (in hundredths) | 90.00% |  |  |  |
Ordinary dividends declared and paid | $ 3,025,032 |  | $ 3,003,030 |  |
Federal excise tax (in hundredths) | 4.00% |  |  |  |
Minimum distribution to avoid excise tax (in hundredths) | 98.00% |  |  |  |
Investment company ordinary taxable income, Maximum (in hundredths) |  | 100.00% |  | 100.00% |
Federal tax rate (in hundredths) | 35.00% |  |  |  |
Distributed net capital gains (in dollars per share) | $ 20.34 | $ 17.59 |  |  |
Net long term unrealized capital gains, tax basis |  | 3,214,547 |  | 3,568,376 |
Net long-term capital gains, book basis |  | 2,319,012 |  | 4,465,088 |
Long term capital gains federal taxes |  | 1,125,092 |  | 1,248,932 |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Net realized gain on investments | 89,557,814 |  | 11,826,876 |  | 63,462,583
Income tax expense | 2,497,000 |  | 2,662,000 |  | 1,930,000
Period expected to maintain regulated investment company status | 1 year |  |  |  |
Net Realized Gains (Losses) on Investments [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Net realized gain on investments |  | 69,144,794 |  | 4,465,088 |
Capital gain distribution |  | (66,825,782) |  | 0 |
Income tax expense |  | 1,125,092 |  | 1,248,932 |
Net realized gains on investments |  | 1,193,920 |  | 3,216,156 |
Net realized gains on investment (for tax purposes) |  | 3,214,547 |  | 3,568,376 |
Control Investment [Member] | Net Realized Gains (Losses) on Investments [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Net realized gain on investments |  | 0 |  | 0 |
Affiliated Investments [Member] | Net Realized Gains (Losses) on Investments [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Net realized gain on investments |  | 66,037,485 |  | 0 |
Non-Control/Non-Affiliated Investments [Member] | Net Realized Gains (Losses) on Investments [Member] |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |
Net realized gain on investments |  | $ 3,107,309 |  | $ 4,465,088 |

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