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Note 7 - Accounts Payable and Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Patent and legal costs $ 22 $ 65
Accrued compensation 972 563
Warranty costs 82 48
Consulting costs 269 2
Taxes and other 21 43
Accrued Liabilities, Current, Total $ 1,366 $ 721