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Acquisition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Business Acquisition [Line Items]    
Business acquisition, name of acquired entity   PPC
Business acquisition, description of acquired entity   a pipe coating company in Camrose, Alberta
Business acquisition, date of acquisition agreement   Feb. 04, 2016
Equity method investment, ownership percentage   49.00%
Cash purchase consideration   $ 7,587
Loan payable purchase consideration   2,000
Purchase consideration to third party   9,587
Fair value of 49% previously held equity interest   7,492
Total purchase consideration   17,079
Assets acquired, cash and equivalents   2,915
Assets acquired property, plant, and equipment   13,124
Goodwill $ 2,423 2,279
Assets acquired net working capital   406
Assets acquired other assets (liabilities) net   (1,645)
Net assets acquired   17,079
Business acquisition, transaction costs   200
Loss on consolidation of joint venture $ 0 $ 1,620