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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies - Warranty Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balance at the beginning of year $ 245 $ 246
Accruals/additions 288 399
Usage/claims (339) (400)
Balance at end of year $ 194 $ 245