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Note 3 - Stock-based Compensation (Tables) | 9 Months Ended
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Dec. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Cost of revenues |  | $ | 62 |  |  | $ | 89 |  |  | $ | 230 |  |  | $ | 195 |
Research and development |  |  | 158 |  |  |  | 214 |  |  |  | 469 |  |  |  | 570 |
Selling, general and administrative |  |  | 920 |  |  |  | 1,137 |  |  |  | 2,909 |  |  |  | 2,727 |
Total |  | $ | 1,140 |  |  | $ | 1,440 |  |  | $ | 3,608 |  |  | $ | 3,492 |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
Expected volatility |  |  | 71.40 | %
Risk-free interest rate |  |  | 3.10 | %
Expected life (years) |  |  | 6.14 |
Dividend yield |  | None |

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