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Note 6 - Product Warranties - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance at beginning of year $ 1,637 $ 1,361
Provision 389 510
Claims (313) (395)
Balance at end of period $ 1,713 $ 1,476