PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Property, plant and equipment
Property and equipment, gross	$ 24,324	$ 19,680
Less - accumulated depreciation	9,025	6,568
Property, plant and equipment, net	15,299	13,112
Land and improvements
Property, plant and equipment
Property and equipment, gross	863	863
Building and improvements
Property, plant and equipment
Property and equipment, gross	5,427	5,148
Furniture, machinery and equipment
Property, plant and equipment
Property and equipment, gross	13,446	9,961
Trucks and other vehicles
Property, plant and equipment
Property and equipment, gross	4,293	$ 3,708
Other
Property, plant and equipment
Property and equipment, gross	$ 295