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Note 5 - Stock-based Compensation (Details Textual)
3 Months Ended 6 Months Ended 15 Months Ended
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
May 31, 2025
shares
Number of Stock-based Compensation Plans in Effect 2   2   2  
Share-Based Payment Arrangement, Expense $ 672,000 $ 425,000 $ 1,145,000 $ 585,000    
Employee Service Share Based Compensation, Nonvested Awards, Total Compensation, Cost Not Yet Recognized, Stock Options $ 0   $ 0   $ 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | shares 0 0 0 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period (in shares) | shares 0 0        
Restricted Stock Units (RSUs) [Member]            
Share-Based Payment Arrangement, Expense $ 622,000 $ 425,000 $ 1,095,000 $ 585,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 3,600,000   $ 3,600,000   $ 3,600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 10 months 24 days      
The 2025 Employee Stock Incentive Plan [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized | shares           750,000
The 2020 Non-employee Director Stock Option Plan [Member] | Three Independent Directors [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | shares   10,800     5,703  
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture   $ 150,000     $ 150,000