INVESTMENTS (Details) (USD $)	6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Mar. 31, 2012
INVESTMENTS [Abstract]
Portfolio investments categorized as Level 3 (in hundredths)	69.60%			56.90%
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 373,500,000
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	317,800,000
Net Unrealized Appreciation (Depreciation)	49,800,000
Net Changes from Unrealized to Realized	0
New / Add-On Investments	5,900,000
Divestitures	0
Fair value end of period	373,500,000
Unrealized gains (losses) included in earnings that related to asset still held at report date	54,724,826		(36,784,513)
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	536,300,000			558,500,000
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	162,800,000			240,700,000
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	0			0
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	373,500,000			317,800,000
Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	11,900,000
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	11,200,000
Net Unrealized Appreciation (Depreciation)	(2,300,000)
Net Changes from Unrealized to Realized	0
New / Add-On Investments	3,000,000
Divestitures	0
Fair value end of period	11,900,000
Debt [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	11,900,000			11,200,000
Debt [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	0			0
Debt [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	0			0
Debt [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	11,900,000			11,200,000
Debt [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	5,700,000
Discount Rate	10.35%
Weighted Average Discount Rate	10.35%
Debt [Member] | Face Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	6,200,000
Preferred & Common Equity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	351,000,000
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	317,800,000
Weighted Average Multiple	6.27
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	19,800,000
Weighted Average Multiple	1.35
Preferred & Common Equity [Member] | Net Book Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	6,700,000
Preferred & Common Equity [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	800,000
Discount Rate	1.83%
Weighted Average Discount Rate	1.83%
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	2,500,000
Multiple	1.06
Weighted Average Multiple	1.06
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	3,200,000
Preferred & Common Equity [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	200,000
Preferred & Common Equity [Member] | Minimum [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	3.25
Preferred & Common Equity [Member] | Minimum [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	0.30
Preferred & Common Equity [Member] | Maximum [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	6.50
Preferred & Common Equity [Member] | Maximum [Member] | Market Approach [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Multiple	2.02
Partnership Interest [Member]
Summary of changes in fair value of investments [Roll Forward]
Fair value beginning of period	11,000,000
Net Unrealized Appreciation (Depreciation)	(100,000)
Net Changes from Unrealized to Realized	0
New / Add-On Investments	(300,000)
Divestitures	0
Fair value end of period	10,600,000
Partnership Interest [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	10,600,000			11,000,000
Partnership Interest [Member] | Recurring [Member] | 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] | 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] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	10,600,000			11,000,000
Partnership Interest [Member] | Net Asset Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	10,600,000	[1]
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)	4,800,000
Net Changes from Unrealized to Realized	0
New / Add-On Investments	3,200,000
Divestitures	0
Fair value end of period	41,900,000
Preferred Equity [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	41,900,000			33,900,000
Preferred Equity [Member] | Recurring [Member] | 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] | 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] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	41,900,000			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)	47,400,000
Net Changes from Unrealized to Realized	0
New / Add-On Investments	0
Divestitures	0
Fair value end of period	309,100,000
Common Equity [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	471,900,000			502,400,000
Common Equity [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	162,800,000			240,700,000
Common Equity [Member] | Recurring [Member] | 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] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	309,100,000			261,700,000
Warrant [Member] | Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 0
Stock Price and Expected Volatility	$ 0.00
Warrant [Member] | Maximum [Member] | Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Stock Price and Expected Volatility	$ 0.00

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