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Earnings per share (Tables) | 6 Months Ended
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Jul. 31, 2017
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,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Basic weighted average common shares outstanding | 7,679 |  | 7,481 |  | 7,645 |  | 7,416 |
Dilutive effect of equity compensation plans | — |  | 122 |  | — |  | — |
Weighted average common shares outstanding assuming full dilution | 7,679 |  | 7,603 |  | 7,645 |  | 7,416 |
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 | 163 |  | 356 |  | 163 |  | 378 |
Stock options with an exercise price below the average market price | 255 |  | 248 |  | 255 |  | 226 |

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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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