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Note 17 - Stockholders' Equity (Tables) | 12 Months Ended
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Mar. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2023 |  |  | 2022 |
Stock options |  | $ | 32 |  |  | $ | 3 |
Restricted stock and stock awards |  |  | 4,656 |  |  |  | 4,615 |
Employee stock purchase plan |  |  | 41 |  |  |  | 43 |
Total stock-based compensation expense |  | $ | 4,729 |  |  | $ | 4,661 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Fiscal years ended March 31, |
|  | 2023 |  |  | 2022 |
Cost of revenues |  | $ | 283 |  |  | $ | 209 |
Research and development |  |  | 865 |  |  |  | 820 |
Selling, general and administrative |  |  | 3,581 |  |  |  | 3,632 |
Total |  | $ | 4,729 |  |  | $ | 4,661 |
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, 2022 |  |  | 98,013 |  |  | $ | 28.22 |  |  |  |  |  |  |  |  |
Granted |  |  | 20,564 |  |  |  | 5.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled/forfeited |  |  | (37,572 | ) |  |  | 40.42 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2023 |  |  | 81,005 |  |  | $ | 16.90 |  |  |  | 3.4 |  |  |  | - |
Exercisable at March 31, 2023 |  |  | 60,441 |  |  | $ | 20.63 |  |  |  | 1.4 |  |  |  | - |
Fully vested and expected to vest at March 31, 2023 |  |  | 80,274 |  |  | $ | 17.00 |  |  |  | 3.3 |  |  |  | - |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Fiscal year ended March 31, |  |  | Fiscal year ended March 31, |
|  | 2023 |  |  | 2022 |
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 |
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, 2022 |  |  | 1,102,166 |  |  | $ | 9.62 |  |  |  |  |
Granted |  |  | 914,306 |  |  |  | 4.84 |  |  |  |  |
Vested |  |  | (460,973 | ) |  |  | 9.02 |  |  |  |  |
Forfeited |  |  | (77,500 | ) |  |  | 10.39 |  |  |  |  |
Outstanding at March 31, 2023 |  |  | 1,477,999 |  |  | $ | 6.81 |  |  | $ | 7,257 |

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