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Note 1 - Summary of Significant Accounting Policies - Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance at beginning of year $ 1,438 $ 1,380 $ 1,098
Provision 1,350 1,747 1,689
Claims (1,427) (1,689) (1,407)
Balance at end of year $ 1,361 $ 1,438 $ 1,380