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Note 6 - Stock-Based Compensation (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2021
USD ($)
May 31, 2022
shares
Number of Stock-based Compensation Plans in Effect 4   4    
Share-Based Payment Arrangement, Expense | $ $ 0 $ 32,000 $ 160,000 $ 287,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ $ 0   $ 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 0   0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period (in shares)     0    
The 2020 Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 200,000   200,000    
The 2022 Stock Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)         750,000