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Note 5 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Depreciation $ 1.8 $ 2.0 $ 5.3 $ 6.0