SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Mar. 31, 2013 Investment	Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Number of investments provided by third party valuation services	3
Net asset value percentage of investment provided by third party valuation services (in hundredths)	57.70%
Highly liquid investments original maturity, Maximum	3 months
Annual minimum distribution (in hundredths)	90.00%
Distributed net capital gains (in dollars per share)	$ 20.34	$ 17.59
Corporate tax rate (in hundredths)	35.00%