INVESTMENTS (Details) (USD $)	9 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Mar. 31, 2012
INVESTMENTS [Abstract]
Portfolio investments categorized as Level 3 (in hundredths)	70.10%			56.90%
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 386,500,000
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	317,800,000
Net Unrealized Appreciation (Depreciation)	71,300,000
Net Changes from Unrealized to Realized	(6,300,000)
New / Add-On Investments	3,700,000
Conversion of Security from Debt to Equity	0
Fair value end of period	386,500,000
Unrealized gains (losses) included in earnings that related to asset still held at report date	78,199,034		10,243,394
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	551,300,000			558,500,000
Recurring [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	164,800,000			240,700,000
Recurring [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
Recurring [Member] | Significant Observable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	386,500,000			317,800,000
Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	7,300,000
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	11,200,000
Net Unrealized Appreciation (Depreciation)	(4,200,000)
Net Changes from Unrealized to Realized	0
New / Add-On Investments	3,500,000
Conversion of Security from Debt to Equity	(3,200,000)
Fair value end of period	7,300,000
Debt [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	7,300,000			11,200,000
Debt [Member] | Recurring [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] | Recurring [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] | Recurring [Member] | Significant Observable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	7,300,000			11,200,000
Debt [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	4,300,000
Discount Rate (in hundredths)	10.00%
Weighted Average Discount Rate (in hundredths)	10.00%
Debt [Member] | Recent Transaction Price [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	3,000,000
Partnership Interest [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	10,000,000	[1]
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	11,000,000
Net Unrealized Appreciation (Depreciation)	(400,000)
Net Changes from Unrealized to Realized	(800,000)
New / Add-On Investments	200,000
Conversion of Security from Debt to Equity	0
Fair value end of period	10,000,000
Partnership Interest [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	10,000,000			11,000,000
Partnership Interest [Member] | Recurring [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] | Recurring [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] | Recurring [Member] | Significant Observable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	10,000,000			11,000,000
Preferred Equity [Member]
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	33,900,000
Net Unrealized Appreciation (Depreciation)	11,800,000
Net Changes from Unrealized to Realized	(4,800,000)
New / Add-On Investments	0
Conversion of Security from Debt to Equity	3,200,000
Fair value end of period	44,100,000
Preferred Equity [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	44,100,000			33,900,000
Preferred Equity [Member] | Recurring [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] | Recurring [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] | Recurring [Member] | Significant Observable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	44,100,000			33,900,000
Common Equity [Member]
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	261,700,000
Net Unrealized Appreciation (Depreciation)	64,100,000
Net Changes from Unrealized to Realized	(700,000)
New / Add-On Investments	0
Conversion of Security from Debt to Equity	0
Fair value end of period	325,100,000
Common Equity [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	489,900,000			502,400,000
Common Equity [Member] | Recurring [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	164,800,000			240,700,000
Common Equity [Member] | Recurring [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] | Recurring [Member] | Significant Observable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	325,100,000			261,700,000
Warrant [Member] | Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	0
Stock Price and Expected Volatility (in dollars per share)	$ 0.00
Preferred & Common Equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	369,200,000
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	325,500,000
Weighted Average Multiple	6.42
Preferred & Common Equity [Member] | Market Approach [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	3.25
Preferred & Common Equity [Member] | Market Approach [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	6.56
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	10,900,000
Weighted Average Multiple	0.95
Preferred & Common Equity [Member] | Market Approach [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	0.30
Preferred & Common Equity [Member] | Market Approach [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	1.70
Preferred & Common Equity [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	800,000
Discount Rate (in hundredths)	1.81%
Weighted Average Discount Rate (in hundredths)	1.81%
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	2,500,000
Multiple	1.05
Weighted Average Multiple	1.05
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	22,600,000
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	200,000
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 6,700,000

[1] All funds are valued in accordance with ASC 820.