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Note 6 - Commitments and Contingencies - Changes in Produce Warranty Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance, January 1 $ 195 $ 95
Assumed warranty obligations – SWE 0 145
Provision for warranties issued 200 114
Settlements made (246) (159)
Balance, December 31 $ 149 $ 195