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Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Beginning balance, January 1, $ 4,106 $ 4,474 $ 3,607
Additions 171 440 929
Deductions (939) (808) (62)
Ending balance, December 31, $ 3,338 $ 4,106 $ 4,474