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Stock-based compensation Stock Compensation (Tables) | 6 Months Ended
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Jul. 31, 2017
Stock-based compensation [Abstract] |
Stock-based compensation expense [Table Text Block] |
| Three Months Ended July 31, | Six Months Ended July 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Stock-based compensation expense |  | $65 |  |  | $68 |  |  | $59 |  |  | $161 |
Restricted stock-based compensation expense |  | $452 |  |  | $390 |  |  | $647 |  |  | $668 |
Fair value assumptions [Table Text Block] |
| Six Months Ended July 31,
Fair value assumptions | 2017 | 2016
Expected volatility | 43.2% | 43.2%
Risk free interest rate | 1.2% | 1.2%
Dividend yield | 0 | 0
Expected life | 5.0 | 5.0
Option activity [Table Text Block] |
Option activity | Options | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term | Aggregate Intrinsic Value
Outstanding at January 31, 2017 | 524 |  |  | $11.55 |  | 4.5 |  | $534 |
Exercised | (24 | ) | 6.74 |  |  | 29 |
Expired or forfeited | (82 | ) | 23.49 |  |  |
Outstanding end of period | 418 |  | 9.49 |  | 4.5 | 274 |
Exercisable end of period | 383 |  |  | $9.59 |  | 4.2 |  | $249 |
Unvested option activity [Table Text Block] |
Unvested option activity | Options | Weighted Average Grant Date Fair Value | Aggregate Intrinsic Value
Outstanding at January 31, 2017 | 74 |  |  | $9.31 |  |  | $69 |
Vested | (32 | ) |  |
Expired or forfeited | (7 | ) | 11.97 |  |
Outstanding end of period | 35 |  |  | $8.42 |  |  | $25 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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 at January 31, 2017 | 290 |  |  | $8.75 |  |  | $2,540 |
Granted | 175 |  | 8.02 |  |
Issued | (55 | ) |  |
Forfeited | (38 | ) | 7.85 |  |
Outstanding end of period | 372 |  |  | $7.93 |  |  | $2,988 |

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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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -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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