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Note 17 - Quarterly Results (Unaudited) (Tables) | 12 Months Ended
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Mar. 31, 2020
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2020 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 26,288 |  |  | $ | 25,536 |  |  | $ | 31,655 |  |  | $ | 34,208 |
Gross profit |  |  | 16,139 |  |  |  | 15,476 |  |  |  | 14,677 |  |  |  | 18,641 |
Net income (loss) |  |  | 4,597 |  |  |  | 3,062 |  |  |  | (4,630 | ) |  |  | (1,680 | )
Basic earnings (loss) per share |  | $ | 1.18 |  |  | $ | 0.74 |  |  | $ | (1.06 | ) |  | $ | (0.38 | )
Diluted earnings (loss) per share |  |  | 1.13 |  |  |  | 0.71 |  |  |  | (1.06 | ) |  |  | (0.37 | )
2019 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Revenues |  | $ | 25,142 |  |  | $ | 24,865 |  |  | $ | 26,682 |  |  | $ | 26,446 |
Gross profit |  |  | 15,091 |  |  |  | 14,577 |  |  |  | 15,634 |  |  |  | 15,614 |
Net income |  |  | 4,230 |  |  |  | 994 |  |  |  | 858 |  |  |  | 1,402 |
Basic earnings per share |  | $ | 1.11 |  |  | $ | 0.26 |  |  | $ | 0.22 |  |  | $ | 0.36 |
Diluted earnings per share |  |  | 1.06 |  |  |  | 0.25 |  |  |  | 0.21 |  |  |  | 0.34 |

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