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Note 3 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Asset Impairment Charges, Total $ 1.5 $ 1.5 $ 2.9 $ 2.9