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Note 15 - Equity-based Compensation - Summary of Stock-based Compensation Expense Included in Results of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock-based compensation expense   $ 224 $ 130 $ 702
General and administrative $ (208)      
Research and Development Expense [Member]        
Stock-based compensation expense 5 2 14 8
Selling and Marketing Expense [Member]        
Stock-based compensation expense 12 53 37 118
General and Administrative Expense [Member]        
Stock-based compensation expense   $ 169 $ 79 $ 576
General and administrative $ (225)