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Note 5 - Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Cash paid for amounts included in the measurements of lease liabilities $ 4,534,000 $ 3,392,000 $ 3,017,000
Operating lease assets obtained in exchange for operating lease liabilities $ 9,863 $ 4,265 $ 1,426