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Investment in joint venture (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2015 | Oct. 31, 2014 | Jan. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
date of investment in joint venture |  |  | Oct. 18, 2009 |  |
initial investment in joint venture |  |  | $ 5,900 |  |
Payments to acquire interest in joint venture |  |  | $ 2,000 |  |
Ownership percentage of joint venture | 49.00% |  | 49.00% |  |
Payments for advance to affiliate |  |  | $ 3,900 |  |
Income from joint venture | $ 408 | $ 903 | 524 | $ 1,114 |
Equity Method Investment, Summarized Financial Information, Current Assets | 11,008 |  | 11,008 |  | $ 13,820
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 13,366 |  | 13,366 |  | 14,023
Equity Method Investment, Summarized Financial Information, Current Liabilities | 5,127 |  | 5,127 |  | 4,499
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 4,220 |  | 4,220 |  | 9,013
Equity Method Investment Summarized Financial Information, Equity | 15,027 |  | 15,027 |  | $ 14,331
Equity Method Investment, Summarized Financial Information, Revenue | 8,780 | 11,886 | 18,922 | 28,666 |
Equity Method Investment, Summarized Financial Information, Gross Profit | 1,603 | 3,310 | 3,082 | 5,426 |
Equity Method Investment, Summarized Financial Information, Income from continuing operations | 1,257 | 2,749 | 1,823 | 3,820 |
Equity Method Investment, Summarized Financial Information, Net income | $ 833 | $ 1,843 | 1,070 | 2,274 |
Payment on loan from joint venture |  |  | $ 1,890 | $ 0 |

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