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Investment in joint venture (Notes)
 6 Months Ended
Jul. 31, 2015
Schedule of Equity Method Investments [Line Items]  
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Investment in joint venture. In October 2009, the Company invested $5.9 million, which consisted of $2 million for a 49% interest and $3.9 million for a note receivable, in a Canadian joint venture with The Bayou Companies, Inc., a subsidiary of Aegion Corporation. The joint venture operates in Camrose, Alberta, Canada, which provides the Company the opportunity to participate in the growing oil sands market. During the first six months of 2015, the Company received $1.9 million in principle repayments on the note receivable.

The Company accounts for the investment in the joint venture using the equity method. The financial results are included in the Company's consolidated financial statements.
 
Six Months Ended July 31,
 
2015

2014

Share of income from joint venture

$116


$211


The following information summarizes the joint venture financial data as of July 31, 2015 and January 31, 2015, respectively:
 
July 31, 2015

January 31, 2015

Current assets
$7,789
$13,820
Noncurrent assets
13,733

14,023

Current liabilities
2,949

4,499

Noncurrent liabilities
4,276

9,013

Equity
14,297

14,331


 
Six Months Ended July 31,
 
2015

2014

Revenue

$10,343


$16,879

Gross profit
1,508

2,128

Income from continuing operations
625

1,078

Net income (loss)
237

430