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Note 6 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Depreciation $ 2.0 $ 2.2 $ 4.0 $ 4.5