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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Depreciation $ 0.1 $ 0.8
Equipment [Member]    
Property, Plant and Equipment, Disposals   $ 3.3
Software and Software Development Costs [Member]    
Impairment, Long-Lived Asset, Held-for-Use $ 0.9