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INVESTMENTS (Details) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
INVESTMENTS [Abstract] |  |
Portfolio investments categorized as Level 3 (in hundredths) | 70.80% | 56.90%
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 406,500,000 | $ 317,800,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 574,200,000 | 558,500,000
Summary of changes in fair value of investments [Roll Forward] |  |
Fair value at beginning of period | 317,800,000 | 462,500,000
Net Unrealized Appreciation (Depreciation) | 90,500,000 | 79,700,000
New Investments | 4,500,000 | 14,200,000
Divestures | (9,800,000) | (7,100,000)
Net Changes from Unrealized to Realized | 3,500,000 | (4,400,000)
Conversion of Security from Debt to Equity | 0 | 0
Transfers out of Level 3 | 0 | 227,100,000
Fair value at end of period | 406,500,000 | 317,800,000
Unrealized gains (losses) included in earnings that related to asset still held at report date | 120,777,969 | 96,949,860
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 167,700,000 | 240,700,000
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Significant Observable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 406,500,000 | 317,800,000
Debt [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 6,600,000 | 11,200,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 6,600,000 | 11,200,000
Summary of changes in fair value of investments [Roll Forward] |  |
Fair value at beginning of period | 11,200,000 | 12,700,000
Net Unrealized Appreciation (Depreciation) | (5,400,000) | (4,600,000)
New Investments | 4,000,000 | 6,600,000
Divestures | 0 | (1,000,000)
Net Changes from Unrealized to Realized | 0 | (2,500,000)
Conversion of Security from Debt to Equity | (3,200,000) | 0
Transfers out of Level 3 | 0 | 0
Fair value at end of period | 6,600,000 | 11,200,000
Debt [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Debt [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Debt [Member] | Significant Observable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 6,600,000 | 11,200,000
Debt [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 3,100,000 | 8,000,000
Weighted Average Discount Rate (in hundredths) | 10.77% | 14.74%
Debt [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Discount Rate (in hundredths) | 10.02% | 10.31%
Debt [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Discount Rate (in hundredths) | 12.00% | 16.22%
Debt [Member] | Recent Transaction Price [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 3,500,000 | 3,200,000
Partnership Interest [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 12,200,000 | 11,000,000
Summary of changes in fair value of investments [Roll Forward] |  |
Fair value at beginning of period | 11,000,000 | 9,500,000
Net Unrealized Appreciation (Depreciation) | 1,500,000 | 200,000
New Investments | 500,000 | 1,300,000
Divestures | 0 | 0
Net Changes from Unrealized to Realized | (800,000) | 0
Conversion of Security from Debt to Equity | 0 | 0
Transfers out of Level 3 | 0 | 0
Fair value at end of period | 12,200,000 | 11,000,000
Partnership Interest [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Partnership Interest [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Partnership Interest [Member] | Significant Observable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 12,200,000 | 11,000,000
Partnership Interest [Member] | Net Asset Value [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 12,200,000 | 11,000,000
Preferred Equity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 44,600,000 | 33,900,000
Summary of changes in fair value of investments [Roll Forward] |  |
Fair value at beginning of period | 33,900,000 | 45,800,000
Net Unrealized Appreciation (Depreciation) | 12,300,000 | (2,900,000)
New Investments | 0 | 6,300,000
Divestures | (9,800,000) | (6,100,000)
Net Changes from Unrealized to Realized | 5,000,000 | (9,200,000)
Conversion of Security from Debt to Equity | 3,200,000 | 0
Transfers out of Level 3 | 0 | 0
Fair value at end of period | 44,600,000 | 33,900,000
Preferred Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Preferred Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Preferred Equity [Member] | Significant Observable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 44,600,000 | 33,900,000
Common Equity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 510,800,000 | 502,400,000
Summary of changes in fair value of investments [Roll Forward] |  |
Fair value at beginning of period | 261,700,000 | 394,500,000
Net Unrealized Appreciation (Depreciation) | 82,100,000 | 87,000,000
New Investments | 0 | 0
Divestures | 0 | 0
Net Changes from Unrealized to Realized | (700,000) | 7,300,000
Conversion of Security from Debt to Equity | 0 | 0
Transfers out of Level 3 | 0 | 227,100,000
Fair value at end of period | 343,100,000 | 261,700,000
Common Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 167,700,000 | 240,700,000
Common Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 0 | 0
Common Equity [Member] | Significant Observable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments | 343,100,000 | 261,700,000
Preferred & Common Equity [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 387,700,000 | 295,600,000
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 342,200,000 | 270,200,000
Weighted Average Multiple | 6.45 | 5.71
Preferred & Common Equity [Member] | Market Approach [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Multiple | 3.25 | 3.25
Preferred & Common Equity [Member] | Market Approach [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Multiple | 7.00 | 6.50
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 11,100,000 | 11,700,000
Weighted Average Multiple | 0.97 | 1.48
Preferred & Common Equity [Member] | Market Approach [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Multiple | 0.25 | 1.10
Preferred & Common Equity [Member] | Market Approach [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Multiple | 1.82 | 1.97
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 7,900,000 | 5,500,000
Preferred & Common Equity [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 700,000 | 800,000
Discount Rate (in hundredths) | 1.75% | 3.56%
Weighted Average Discount Rate (in hundredths) | 1.75% | 3.56%
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 3,000,000 | 2,300,000
Multiple | 1.22 | 1.00
Weighted Average Multiple | 1.22 | 1.00
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | 22,600,000 | 5,000,000
Preferred & Common Equity [Member] | Market Approach [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value | $ 200,000 | $ 100,000

X
- Definition The weighted average interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in trading revenues. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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. + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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