UNALLOCATED RESERVE AND DISTRIBUTIONS (Details) (USD $)	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Jan. 31, 2014
UNALLOCATED RESERVE AND DISTRIBUTIONS
Cash and U.S. Government securities	$ 1,129,534		$ 8,435,591
Distribution payable			(7,478,406)
Unallocated cash and U.S. Government securities	1,129,534		957,185
Reconciliation of unallocated reserve
Unallocated reserve at the beginning of the period	984,094
Net income	137,218	2,202,389
Unallocated reserve at the end of the period	1,121,312
Within a range of not less
UNALLOCATED RESERVE AND DISTRIBUTIONS
Unallocated cash and U.S. Government securities	500,000
Within a range of not more
UNALLOCATED RESERVE AND DISTRIBUTIONS
Unallocated cash and U.S. Government securities	$ 1,000,000