PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Property, plant and equipment
Property and equipment, gross	$ 19,680	$ 17,390
Less - accumulated depreciation	6,568	5,082
Property, plant and equipment, net	13,112	12,308
Land and improvements
Property, plant and equipment
Property and equipment, gross	863	863
Buildings and improvements
Property, plant and equipment
Property and equipment, gross	5,148	5,111
Furniture, machinery and equipment
Property, plant and equipment
Property and equipment, gross	9,961	8,510
Trucks and other vehicles
Property, plant and equipment
Property and equipment, gross	$ 3,708	$ 2,906