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Investment in joint venture (Notes)
 3 Months Ended
Apr. 30, 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.

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.
 
Three Months Ended April 30,
 
2015

2014

Share of income (loss) from joint venture

$165


($8
)

The following information summarizes the joint venture financial data as of April 30, 2015 and January 31, 2015, respectively:
 
April 30, 2015

January 31, 2015

Current assets
$9,588
$13,820
Noncurrent assets
12,217

14,023

Current liabilities
2,529

4,499

Noncurrent liabilities
6,825

9,013

Equity
12,451

14,331


 
Three Months Ended April 30,
 
2015

2014

Revenue

$6,267


$8,937

Gross profit
1,167

725

Income from continuing operations
685

213

Net income (loss)
337

(16
)