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Note 9 - Allowance for Credit Losses (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts Receivable, before Allowance for Credit Loss $ 334,034    
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 11,097 $ 7,668 $ 6,968