Note 14 - Income Taxes - Open Tax Years and Jurisdictions That the Company Used in Its Evaluation of Tax Positions (Details) |
12 Months Ended |
|---|---|
Mar. 31, 2025 | |
| Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | |
| Open tax year | 2022 2023 2024 2025 |
| State and Local Jurisdiction [Member] | Hawaii Department of Taxation [Member] | |
| Open tax year | 2022 2023 2024 2025 |
| State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | |
| Open tax year | 2021 2022 2023 2024 2025 |