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Note 1 - General (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 15.6 $ 18.4
Accounts Receivable, Credit Loss Expense (Reversal) 0.6  
Accounts Receivable, Allowance for Credit Loss, Writeoff $ 3.4