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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Depreciation $ 0.8 $ 2.4 $ 1.1 $ 2.9