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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Net income per common share:        
Net income $ 2,558 $ 9,339 $ 7,199 $ 17,973
Denominator for basic net income per share (weighted-average shares which exclude shares in the treasury, 509,242 at April 30, 2021 and 2020 7,982,995 7,976,275 7,964,058 7,974,370
Effect of dilutive securities from restricted stock plan 158,112 103,469 156,351 87,948
Denominator for diluted net income per share (adjusted weighted average shares) 8,141,107 8,079,744 8,120,409 8,062,318
Basic net income per share $ 0.32 $ 1.17 $ 0.90 $ 2.25
Diluted net income per share $ 0.31 $ 1.16 $ 0.89 $ 2.23