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Note 1 - Summary of Significant Accounting Policies - Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of year $ 1,361 $ 1,438 $ 1,380
Provision 1,813 1,350 1,747
Claims (1,537) (1,427) (1,689)
Balance at end of year $ 1,637 $ 1,361 $ 1,438