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Note 16 - Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2024
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2024 |  |  | 2023 |
Stock options |  | $ | 40 |  |  | $ | 32 |
Restricted stock and stock awards |  |  | 4,563 |  |  |  | 4,656 |
Employee stock purchase plan |  |  | 49 |  |  |  | 41 |
Total stock-based compensation expense |  | $ | 4,652 |  |  | $ | 4,729 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2024 |  |  | 2023 |
Cost of revenues |  | $ | 293 |  |  | $ | 283 |
Research and development |  |  | 627 |  |  |  | 865 |
Selling, general and administrative |  |  | 3,732 |  |  |  | 3,581 |
Total |  | $ | 4,652 |  |  | $ | 4,729 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Options / Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (thousands) |
Outstanding at March 31, 2023 |  |  | 81,205 |  |  | $ | 16.92 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled/forfeited |  |  | (44,999 | ) |  |  | 24.95 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2024 |  |  | 36,206 |  |  | $ | 6.94 |  |  |  | 6.2 |  |  | $ | 238 |
Exercisable at March 31, 2024 |  |  | 25,924 |  |  | $ | 7.34 |  |  |  | 5.4 |  |  | $ | 160 |
Fully vested and expected to vest at March 31, 2024 |  |  | 36,107 |  |  | $ | 6.94 |  |  |  | 6.2 |  |  | $ | 237 |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
Expected volatility |  |  | 71.4 | %
Risk-free interest rate |  |  | 3.1 | %
Expected life (years) |  |  | 6.1 |
Dividend yield |  |  | None |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Intrinsic Aggregate Value (thousands) |
Outstanding at March 31, 2023 |  |  | 1,477,999 |  |  | $ | 6.89 |  |  |  |  |
Granted |  |  | 735,175 |  |  |  | 6.57 |  |  |  |  |
Vested |  |  | (735,267 | ) |  |  | 6.83 |  |  |  |  |
Forfeited |  |  | (52,253 | ) |  |  | 7.31 |  |  |  |  |
Outstanding at March 31, 2024 |  |  | 1,425,654 |  |  | $ | 6.74 |  |  | $ | 19,261 |

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