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Note 1 - General (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 16.3 $ 16.3 $ 18.4
Accounts Receivable, Credit Loss Expense (Reversal) 0.8 1.5  
Accounts Receivable, Allowance for Credit Loss, Writeoff $ 0.2 $ 3.6