Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity	Bayou Perma-Pipe Canada, Ltd
Business Acquisition, Description of Acquired Entity	a coating and insulation company in Camrose, Alberta
Business Acquisition, Date of Acquisition Agreement	Feb. 04, 2016
Equity Method Investment, Ownership Percentage			49.00%
Cash	$ 7,587
Loan payable	2,000
Purchase consideration to third party	9,587
Fair Value of 49% Previously Held Equity Interest	7,492
Total purchase consideration	17,079
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,915
Property and equipment	12,670
Goodwill	2,693		$ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	406
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(1,605)
Net assets acquired	17,079
Loss on consolidation of joint venture	1,620	$ 0
Net sales	23,069	20,277
Business acquisition, pro forma net sales		26,544
Net loss	$ (6,294)	(4,655)
Business acquisition, pro forma net loss		$ (3,923)
Loss per share, basic and diluted	$ (0.86)	$ (0.64)
Business acquisition, pro forma loss per share, basic and diluted		$ (0.54)