PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense and Cost of Maintenance and Repairs (Details) - USD ($)	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
PROPERTY, PLANT AND EQUIPMENT
Depreciation expense	$ 779,000	$ 551,000	$ 549,000
Costs of maintenance and repairs	$ 826,000	$ 304,000	$ 250,000