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Note 9 - Allowance for Credit Losses - Summary of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Balance at beginning of period $ 7,668 $ 6,968
Adoption of ASU 2016-13 0 1,147
Provision for credit losses 3,513 3,830
Charge-offs (116) (279)
Currency translation 32 (569)
Balance at end of period $ 11,097 $ 11,097