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Note 1 - Significant Accounting Policies - Interest Income, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Interest expense | $ (9) | $ (5)
Interest income | 896 | 1,160
Interest income, net | $ 887 | $ 1,155

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