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Note 3 - Stock-based Compensation (Tables) | 3 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |
|  | 2023 |  |  | 2022 |
Cost of revenues |  | $ | 109 |  |  | $ | 29 |
Research and development |  |  | 156 |  |  |  | 179 |
Selling, general and administrative |  |  | 1,092 |  |  |  | 825 |
Total |  | $ | 1,357 |  |  | $ | 1,033 |
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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