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Note 8 - Property, Plant & Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Depreciation, Total $ 5.7 $ 6.3 $ 11.7 $ 12.6
Interest Paid, Capitalized, Investing Activities $ 0.1 $ 0.2 $ 0.2 $ 0.3