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Note 4 - Stock-based Compensation (Tables) | 3 Months Ended
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Jun. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |
|  | 2022 |  |  | 2021 |
Cost of revenues |  | $ | 29 |  |  | $ | 91 |
Research and development |  |  | 179 |  |  |  | 247 |
Selling, general and administrative |  |  | 825 |  |  |  | 954 |
Total |  | $ | 1,033 |  |  | $ | 1,292 |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Three Months Ended June 30,
|  | 2022 |  | 2021
Expected volatility |  | 71.4% |  | N/A
Risk-free interest rate |  | 3.1% |  | N/A
Expected life (years) |  | 6.14 |  | N/A
Dividend yield |  | None |  | N/A

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