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Note 4 - Stock-based Compensation (Tables) | 9 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 36 |  |  | $ | (23 | ) |  | $ | 148 |  |  | $ | 35 |
Research and development |  |  | 190 |  |  |  | 179 |  |  |  | 629 |  |  |  | 470 |
Selling, general and administrative |  |  | 894 |  |  |  | 683 |  |  |  | 2,736 |  |  |  | 2,092 |
Total |  | $ | 1,120 |  |  | $ | 839 |  |  | $ | 3,513 |  |  | $ | 2,597 |

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