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Note H - Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Depreciation, Total | $ 24.8 | $ 24.2 | $ 23.5
Interest Paid, Capitalized, Investing Activities | $ 0.9 | $ 0.4 | $ 0.2

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