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Note 8 - Earnings (Loss) Per Share - Summary of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2021
Jul. 31, 2020
Basic weighted average common shares outstanding (in shares) 8,151   8,126   8,158 8,087
Dilutive effect of equity compensation plans (in shares) 170   152   132 0
Weighted average common shares outstanding assuming full dilution (in shares) 8,321   8,278   8,290 8,087
Stock options and restricted stock not included in the computation of diluted earnings per share of common stock because the option exercise prices or grant date prices exceeded the average market prices of the common shares (in shares) 166   248   203 197
Stock options and restricted stock with exercise prices or grant date prices below the average market prices (in shares) 170   152   132 203
Net income (loss) $ 3,416 $ (843) $ 267 $ (2,521) $ 2,573 $ (2,254)
Basic (in dollars per share) $ 0.42   $ 0.03   $ 0.32 $ (0.28)
Diluted (in dollars per share) $ 0.41   $ 0.03   $ 0.31 $ (0.28)