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Note 5 - Supplemental Information - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Depreciation, Total $ 1,106 $ 1,074 $ 4,028 $ 2,899
Cost of Sales [Member]        
Depreciation, Total 610 788 2,376 2,117
Operating Expense [Member]        
Depreciation, Total $ 496 $ 286 $ 1,652 $ 782