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Note 5 - Revenues - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Allowance for doubtful accounts, Balance $ 275 $ 255
Provision for losses on accounts receivable 5 9
Write-offs less recoverieis (3) (2)
Allowance for doubtful accounts, Balance $ 277 $ 262