v3.26.1
Note 7 - Stock-based Compensation (Details Textual) - shares
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) 0 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Period Increase (Decrease) (in shares) 0 0  
Minimum [Member]      
Unearned Bonuses Waivable, Percentage     50.00%
Minimum [Member] | Share-Based Payment Arrangement, Option [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 1 year    
Maximum [Member]      
Unearned Bonuses Waivable, Percentage     67.00%
Maximum [Member] | Share-Based Payment Arrangement, Option [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) 10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 4 years    
The 2006 Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     0
The 2020 Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     750,000
The 2015 Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     0