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Earnings per share | 6 Months Ended
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Jul. 31, 2018
Earnings Per Share [Abstract] |
Earnings per share [Text Block] | Earnings per share
| Three Months Ended July 31, | Six Months Ended July 31,
| 2018 | 2017 | 2018 | 2017
Basic weighted average common shares outstanding | 7,820 |  | 7,679 |  | 7,769 |  | 7,645 |
Dilutive effect of equity compensation plans | — |  | — |  | — |  | — |
Weighted average common shares outstanding assuming full dilution | 7,820 |  | 7,679 |  | 7,769 |  | 7,645 |
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 | 178 |  | 163 |  | 178 |  | 163 |
Stock options with an exercise price below the average market price | 90 |  | 255 |  | 90 |  | 255 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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