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Note 1 - Summary of Significant Accounting Policies - Product Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance at beginning of year $ 1,380 $ 1,098 $ 1,435
Provision 1,747 1,689 1,377
Claims (1,689) (1,407) (1,714)
Balance at end of year $ 1,438 $ 1,380 $ 1,098