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Note 5 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Depreciation $ 0.1 $ 0.2 $ 0.2 $ 0.8