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Note 9 - Allowance for Credit Losses (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts Receivable, before Allowance for Credit Loss $ 409,423    
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 11,183 $ 11,097 $ 6,968