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Note 2 - Summary of Significant Accounting Policies - Warrant Accrual Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Beginning balance $ 80 $ 0
Add: Accruals for warranties issued during the period 42 80
Less: Adjustment for inventory at cost and excessive and obsolete inventory (72) 0
Ending balance $ 50 $ 80