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Note 11 - Accrued Liabilities - Changes in Warranty Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Beginning balance $ 126 $ 150
Warranty provision 15 16
Warranty settlements (7) (40)
Ending balance $ 134 $ 126