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Note 3 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Amortized cost, as adjusted | $ 144,101 | $ 131,106
Gross unrealized holding gains | 27 | 64
Gross unrealized holding losses | (6) | 0
Estimated fair value | 144,122 | 131,170
US Government Agencies Debt Securities [Member] |  |
Amortized cost, as adjusted | 144,101 | 131,106
Gross unrealized holding gains | 27 | 64
Gross unrealized holding losses | (6) | 0
Estimated fair value | $ 144,122 | $ 131,170

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