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Note 3 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Asset Impairment Charges, Total $ 1.5 $ 1.4 $ 4.4 $ 4.3