STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details 3) - $ / shares	9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	305,500	303,000
Shares, Granted	240,000	220,500
Shares, Vested	(220,500)	(228,000)
Shares, Nonvested, Ending balance	325,000	295,500
Weighted Average Fair Value, Nonvested, Beginning balance	$ 7.14	$ 4.40
Weighted Average Fair Value, Granted	9.13	6.60
Weighted Average Fair Value, Vested	6.60	3.85
Weighted Average Fair Value, Nonvested, Ending balance	$ 8.97	$ 6.47