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Deferred and restricted stock (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Restricted stock [Line Items] |  |  |
Deferred compensation liabilities | $ 529,000 | $ 495,000 |
Restricted stock grants | 254,000 | 108,000 |
Restricted stock granted, weighted average grant price | $ 7.29 | $ 6.38 |
Restricted stock issued | (91,000) | (26,000) |
Restricted stock forfeited | (36,000) | (5,000) |
Restricted stock, forfeitures, weighted average grant price | $ 7.75 | $ 6.38 |
Deferred shares outstanding |  | 163,000 | 86,000
Restricted stock, outstanding, weighted average grant price | $ 8.75 | $ 6.40 | $ 14.52
Restricted stock, aggregate intrinsic value | $ 2,540,000 | $ 1,040,000 | $ 1,242,000
Unrecognized restricted stock expense | $ 200,000 |  |
Cost is expected to be recognized over the weighted-average period | 2 years |  |
Director [Member] |  |  |
Restricted stock [Line Items] |  |  |
Deferred shares granted value | $ 40,000 |  |
Deferred Compensation, Share-based Payments [Member] |  |  |
Restricted stock [Line Items] |  |  |
Deferred shares outstanding | 60,495 |  |
Restricted Stock [Member] |  |  |
Restricted stock [Line Items] |  |  |
Deferred shares outstanding | 290,000 |  |
Vesting period restricted stock | 3 years |  |
Unrecognized restricted stock expense | $ 1,200,000 |  |
Cost is expected to be recognized over the weighted-average period | 2 years 2 months |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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