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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Depreciation $ 0.8 $ 0.9 $ 1.6 $ 1.8