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Note 2 - Allowance for Doubtful Accounts Receivable - Allowance for Doubtful Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at the beginning of year $ 7,667 $ 2,964 $ 2,042
Provision for bad debts - accounts receivable 2,260 6,746 1,323
Charge-offs (3,653) (2,087) (401)
Recoveries 119 44 0
Balance at the end of year $ 6,393 $ 7,667 $ 2,964