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Note 5 - Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Stock Based Compensation $ 278 $ 262 $ 570 $ 576
General and Administrative Expense [Member]        
Stock Based Compensation $ 278 $ 262 $ 570 $ 576