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Note 8 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accrued warranty obligations – beginning $ 149 $ 195
Accruals for warranties issued 45 27
Settlements made (23) (12)
Accrued warranty obligations – ending $ 171 $ 210