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Earnings per share | 9 Months Ended
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Oct. 31, 2017
Earnings Per Share [Abstract] |
Earnings per share [Text Block] | Earnings per share.
| Three Months Ended October 31, | Nine Months Ended October 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Basic weighted average common shares outstanding | 7,714 |  | 7,541 |  | 7,668 |  | 7,457 |
Dilutive effect of equity compensation plans | — |  | — |  | — |  | — |
Weighted average common shares outstanding assuming full dilution | 7,714 |  | 7,541 |  | 7,668 |  | 7,457 |
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 | 143 |  | 270 |  | 143 |  | 336 |
Stock options with an exercise price below the average market price | 226 |  | 304 |  | 226 |  | 238 |

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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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