STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details 3) - $ / shares	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	305,500	303,000
Shares, Granted	135,000	180,500
Shares, Vested	(180,500)	(81,000)
Shares, Nonvested, Ending balance	260,000	402,500
Weighted Average Fair Value, Nonvested, Beginning balance	$ 7.14	$ 4.40
Weighted Average Fair Value, Granted	8.99	6.28
Weighted Average Fair Value, Vested	6.28	3.30
Weighted Average Fair Value, Nonvested, Ending balance	$ 8.70	$ 5.46