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Net Income (loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2019
Net income per common share: |  |  |  |  |
Denominator for diluted earnings per share (adjusted weighted average shares) | 8,123,848 | 8,035,929 | 8,110,435 | 8,044,159 | 8,044,159
Basic net income per share | $ 1.16 | $ 0.14 | $ 3.41 | $ 0.26 | $ 0.26
Diluted net income per share | $ 1.14 | $ 0.14 | $ 3.36 | $ 0.26 | $ 0.26
Net income | $ 9,264 | $ 1,146 | $ 27,237 | $ 2,076 | $ 2,076
Denominator for basic net income per share (weighted-average shares which exclude shares in the treasury, 509,242 at July 31, 2020 and 471.289 for July 31, 2019 | 7,979,902 | 8,004,640 | 7,976,228 | 8,013,383 |
Effect of dilutive securities from restricted stock plan | 143,946 | 31,289 | 134,207 | 30,776 |

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