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Note 4 - Receivables and Allowance for Credit Losses - Summary of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Allowance - beginning of period $ 484 $ 486
Provision for expected credit losses 92 182
Amounts written off against the allowance (54) (19)
Allowance - end of period $ 522 $ 649