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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)     5 years 7 months 9 days  
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member] | General and Administrative Expense [Member]        
Share-Based Payment Arrangement, Expense $ 3 $ 151 $ 6 $ 377
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | General and Administrative Expense [Member]        
Share-Based Payment Arrangement, Expense   $ 43 0 $ 86
Time Vesting Awards [Member] | Share-Based Payment Arrangement, Employee [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 9   9  
Time Vesting Awards [Member] | Share-Based Payment Arrangement, Nonemployee [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 0   $ 0