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Stock-based compensation Stock Compensation (Tables) | 6 Months Ended
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Jul. 31, 2018
Stock-based compensation [Abstract] |
Stock-based compensation expense [Table Text Block] |
| Three Months Ended July 31, | Six Months Ended July 31,
| 2018 |  | 2017 |  | 2018 |  | 2017 |
Stock-based compensation expense |  | $9 |  |  | $65 |  |  | $23 |  |  | $59 |
Restricted stock-based compensation expense |  | $432 |  |  | $452 |  |  | $688 |  |  | $647 |
Option activity [Table Text Block] |
Option activity | No. of Shares UnderlyingOptions | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term | Aggregate Intrinsic Value
Outstanding at January 31, 2018 | 358 |  |  | $9.44 |  | 4.0 |  | $482 |
Exercised | (37 | ) | 6.88 |  |  | 37 |
Expired or forfeited | (53 | ) | 17.14 |  |  |
Outstanding end of period | 268 |  | 8.42 |  | 4.1 | 392 |
Exercisable end of period | 257 |  |  | $8.48 |  | 3.9 |  | $370 |
Unvested option activity [Table Text Block] |
Unvested option activity | No. of Shares UnderlyingOptions | Weighted Average Grant Date Fair Value | Aggregate Intrinsic Value
Outstanding at January 31, 2018 | 31 |  |  | $8.24 |  |  | $50 |
Vested | (14 | ) |  |
Expired or forfeited | (6 | ) |  |  |
Outstanding end of period | 11 |  |  | $7.00 |  |  | $23 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
Restricted stock activity | Restricted Shares | Weighted Average Grant Price Per Share | Aggregate Intrinsic Value
Outstanding (unvested) at January 31, 2018 | 360 |  |  | $9.05 |  |  | $3,254 |
Granted | 124 |  | 9.75 |  |
Vested and issued | (88 | ) |  |
Forfeited | (63 | ) | 7.19 |  |
Outstanding (unvested) end of period | 333 |  |  | $9.05 |  |  | $3,022 |

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- Definition Stock-based compensation [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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