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Note 8 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accrued warranty obligations – beginning $ 149 $ 195
Accruals for warranties issued 121 59
Settlements made (108) (26)
Accrued warranty obligations – ending $ 162 $ 228