STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	305,500	303,000	388,500
Shares, Granted	300,000	305,500	303,000
Shares, Vested	(305,500)	(303,000)	(384,500)
Shares, Forfeited (non-vested)			(4,000)
Shares, Nonvested, Ending balance	300,000	305,500	303,000
Weighted Average Fair Value, Nonvested, Beginning balance	$ 7.14	$ 4.40	$ 5.67
Weighted Average Fair Value, Granted	8.97	7.14	4.40
Weighted Average Fair Value, Vested	7.23	4.40	5.67
Weighted Average Fair Value, Forfeited (non-vested)			5.71
Weighted Average Fair Value, Nonvested, Ending balance	$ 8.97	$ 7.14	$ 4.40