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Note 5 - Accounts Receivable (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss, Current $ 4.4 $ 3.6  
Accounts Receivable, Credit Loss Expense (Reversal) $ 1.3 $ 1.2 $ 0.6