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Stock options Unvested options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Percentage of options expect to vest | 90.00% |
unvested option [Member] |  |
Options, Nonvested, Number of Shares | 31 | 74
Outstanding options, weighted Average grant date fair value | $ 8.24 | $ 9.31
Options, outstanding, intrinsic value | $ 50 | $ 69
Options granted in period, weighted avg date fair value | $ 0.00 | $ 7.33
Vested options in the period | (36) |
Options, Forfeitures and Expirations in Period | 7 |
Options, Forfeitures and Expirations in Period, Weighted Average grant date fair value | $ 10.43 |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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