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Note 1 - Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for credit losses $ 288 $ 300 $ 327
Additions 25 152 1,443
Deduction 0 164 1,470
Allowance for credit losses 313 288 300
Deduction $ 0 $ (164) $ (1,470)