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Note 4 - Stock-based Compensation (Tables) | 6 Months Ended
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Sep. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Cost of revenues |  | $ | 266 |  |  | $ | 39 |  |  | $ | 605 |  |  | $ | 97 |
Research and development |  |  | 511 |  |  |  | 113 |  |  |  | 1,199 |  |  |  | 256 |
Selling, general and administrative |  |  | 2,989 |  |  |  | 691 |  |  |  | 6,488 |  |  |  | 1,719 |
Total |  | $ | 3,766 |  |  | $ | 843 |  |  | $ | 8,292 |  |  | $ | 2,072 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended September 30, |
|  | 2025 |
Expected volatility |  |  | 74.01 | %
Risk-free interest rate |  |  | 4.19 | %
Expected life (years) |  |  | 6.31 |
Dividend yield |  | None |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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