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Note 3 - Stock-based Compensation (Details Textual) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares) 0 0 0 0        
Share-Based Payment Arrangement, Expense $ 141,000 $ 158,000 $ 62,000 $ 113,000        
Deferred Compensation Share-Based Arrangements, Liability, Current and Noncurrent 415,000 $ 498,000 415,000 $ 498,000        
Restricted Stock [Member]                
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 430,000   $ 430,000          
Restricted Stock [Member] | Forecast [Member]                
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 22,000 $ 134,000 $ 203,000 $ 71,000