BUSINESS COMBINATIONS - Amount of net cash used in acquisition (Details)			12 Months Ended
	Dec. 04, 2015 USD ($) customer	May. 29, 2015 USD ($)	Jan. 31, 2016 USD ($)
APC
Business Combinations
Net assets acquired		$ 11,101,000
Less-shares of common stock issued		3,536,000
Less-escrow liability		1,081,000
Less-cash acquired		2,274,000
Net cash used		$ 4,210,000
APC | Selling, General and Administrative Expenses
Business Combinations
acquisition related costs			$ 460,000
Roberts
Business Combinations
Net assets acquired	$ 16,137,000
Less-cash acquired	2,968,000
Net cash used	$ 13,169,000
Number of customers seeking liquidated damages | customer	1
Potential liquidated damages claim	$ 2,000,000
Roberts | Selling, General and Administrative Expenses
Business Combinations
acquisition related costs			$ 123,000