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Note G - Stock-based Compensation (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Payment Arrangement, Expense $ 0.3 $ 0.3 $ 0.6 $ 0.7