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Note 8 - Accounts Payable and Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Patent and legal costs $ 28 $ 65
Accrued compensation 628 563
Warranty costs 96 48
Taxes and other 72 45
Accrued Liabilities, Current, Total $ 824 $ 721