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Note 17 - Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Mar. 31, 2021
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2021 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 29,941 |  |  | $ | 31,860 |  |  | $ | 34,172 |  |  | $ | 37,964 |
Gross profit |  |  | 20,340 |  |  |  | 21,285 |  |  |  | 20,653 |  |  |  | 24,736 |
Net income (loss) |  |  | 1,217 |  |  |  | 2,679 |  |  |  | (4,542 | ) |  |  | 3,920 |
Basic earnings (loss) per share |  | $ | 0.27 |  |  | $ | 0.52 |  |  | $ | (0.89 | ) |  | $ | 0.76 |
Diluted earnings (loss) per share |  |  | 0.26 |  |  |  | 0.51 |  |  |  | (0.89 | ) |  |  | 0.74 |
2020 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 26,288 |  |  | $ | 25,536 |  |  | $ | 31,655 |  |  | $ | 34,208 |
Gross profit |  |  | 16,204 |  |  |  | 15,586 |  |  |  | 14,803 |  |  |  | 18,769 |
Net income |  |  | 4,662 |  |  |  | 3,172 |  |  |  | (4,504 | ) |  |  | (1,552 | )
Basic earnings per share |  | $ | 1.20 |  |  | $ | 0.76 |  |  | $ | (1.03 | ) |  | $ | (0.37 | )
Diluted earnings per share |  |  | 1.14 |  |  |  | 0.73 |  |  |  | (1.03 | ) |  |  | (0.37 | )

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