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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Proceeds from Stock Options Exercised     $ 0 $ 584,000  
Share-Based Payment Arrangement, Option [Member]          
Allocated Share Based Compensation, Expense (Benefit) $ 189,000 $ 198,000 252,000 $ 752,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 5,400,000   $ 5,400,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 2 months 12 days    
Performance based Stock Options [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     6 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     404,833   0
Service based Stock Options [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)     54,530 96,359  
Service based Stock Options [Member] | Maximum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years    
Service based Stock Options [Member] | Minimum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     5 years    
Nonvested [Member]          
Share-Based Payment Arrangement, Expense $ 0 $ 130,000 $ 156,000 $ 75,000  
Director Plan 2004 [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 3,000,000   3,000,000    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]          
Share Based Compensation, Arrangement By Share Based Payment Award, Options Grant, Amount     $ 100,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     1 year    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Maximum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Minimum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     3 years    
The 2006 Equity Incentive Plan [Member] | Common Stock [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,800,000   1,800,000    
The 2006 Equity Incentive Plan [Member] | Nonvested [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 0   $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Restricted Stock, Outstanding Number (in shares) 0   0