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Note 4 - Stock-based Compensation (Tables) | 9 Months Ended
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Dec. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Cost of revenues |  | $ | 89 |  |  | $ | 36 |  |  | $ | 195 |  |  | $ | 148 |
Research and development |  |  | 214 |  |  |  | 190 |  |  |  | 570 |  |  |  | 629 |
Selling, general and administrative |  |  | 1,137 |  |  |  | 894 |  |  |  | 2,727 |  |  |  | 2,736 |
Total |  | $ | 1,440 |  |  | $ | 1,120 |  |  | $ | 3,492 |  |  | $ | 3,513 |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Expected volatility |  |  | N/A |  |  |  | N/A |  |  |  | 71.40 | % |  |  | N/A |
Risk-free interest rate |  |  | N/A |  |  |  | N/A |  |  |  | 3.10 | % |  |  | N/A |
Expected life (years) |  |  | N/A |  |  |  | N/A |  |  |  | 6.14 |  |  |  | N/A |
Dividend yield |  |  | N/A |  |  |  | N/A |  |  |  | None |  |  |  | N/A |

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