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Note 5 - Supplemental Information - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Depreciation, Total $ 1,518 $ 911 $ 2,922 $ 1,825
Cost of Sales [Member]        
Depreciation, Total 904 655 1,766 1,329
Operating Expense [Member]        
Depreciation, Total $ 614 $ 256 $ 1,156 $ 496