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Stock-based compensation (Tables) | 9 Months Ended
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Oct. 31, 2013
Stock-based compensation [Abstract] |
Stock-based compensation expense [Table Text Block] |
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2013 |  | 2012 |  | 2013 |  | 2012 |
Stock-based compensation expense |  | $27 |  |  | $106 |  |  | $95 |  |  | $366 |
Fair value assumptions [Table Text Block] |
| Nine Months Ended October 31,
Fair value assumptions | 2013 | 2012
Expected volatility | 49.65% - 65.54% | 58.12% - 66.82%
Risk free interest rate | .74% - 2.82% | .74% - 2.82%
Dividend yield | none | none
Expected life | 4.9 - 5.7 years | 4.9 - 5.7 years
Option activity [Table Text Block] |
Option activity | Options | Weighted Average Exercise Price Per Share | Weighted Average Remaining Contractual Term in Years | Aggregate Intrinsic Value
Outstanding at January 31, 2013 | 969 |  |  | $10.77 |  | 6.6 |  | $40 |
Granted | 102 |  | 10.50 |  |  |
Exercised | (135 | ) | 6.72 |  |  | 506 |
Expired or forfeited | (55 | ) | 12.64 |  |  |
Outstanding end of period | 881 |  | 11.25 |  | 6.3 | 2,770 |
Exercisable end of period | 602 |  |  | $12.67 |  | 5.1 |  | $1,748 |
Nonvested option activity [Table Text Block] |
Unvested option activity | Unvested Options Outstanding | Weighted Average Exercise Price Per Share | Aggregate Intrinsic Value
Outstanding at January 31, 2013 | 383 |  |  | $6.91 |  |  | $4 |
Granted | 102 |  | 10.50 |  |
Vested | (181 | ) |  |
Expired or forfeited | (25 | ) | 6.96 |  |
Outstanding end of period | 279 |  |  | $8.18 |  |  | $1,022 |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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