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Note 7 - Accounts Payable and Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Patent and legal costs $ 77 $ 28
Accrued compensation 667 628
Warranty costs 54 96
Consulting costs 0 2
Taxes and other 21 70
Accrued liabilities $ 819 $ 824