NET INCOME PER UNIT (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Jan. 31, 2012
NET INCOME PER UNIT
Accrued income receivable	$ 1,950,191		$ 1,950,191		$ 387,980
Number of units outstanding	13,120,010	13,120,010	13,120,010	13,120,010