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Earnings per share (Tables) | 6 Months Ended
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Jul. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Three Months Ended July 31, | Six Months Ended July 31,
| 2014 |  | 2013 |  | 2014 |  | 2013 |
Basic weighted average common shares outstanding | 7,248 |  | 6,985 |  | 7,212 |  | 6,958 |
Dilutive effect of equity incentive plans | 138 |  | 69 |  | 138 |  | 27 |
Weighted average common shares outstanding assuming full dilution | 7,386 |  | 7,054 |  | 7,350 |  | 6,985 |
Stock options not included in the computation of diluted earnings per share of common stock because the option exercise prices exceeded the average market prices of the common shares | 160 |  | 375 |  | 160 |  | 375 |
Stock options with an exercise price below the average market price | 547 |  | 574 |  | 547 |  | 574 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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