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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Beginning balance, January 1, $ 3,338 $ 4,106 $ 4,474
Additions 1,557 171 440
Deductions (2,300) (939) (808)
Ending balance, December 31, $ 2,595 $ 3,338 $ 4,106