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Note 13 - Stock-based Compensation - Options Outstanding by Exercise Price Range (Details) - $ / shares
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Options outstanding (in shares) 789,345 631,242 588,534
Weighted average exercise price (in dollars per share) $ 82.78    
Weighted average remaining contractual life (Year) 3 years 4 months 24 days    
Exercise Price Range 1 [Member]      
Options outstanding (in shares) 236,279    
Exercise price, lower (in dollars per share) $ 53.94    
Exercise price, upper (in dollars per share) 71.64    
Weighted average exercise price (in dollars per share) $ 59.34    
Weighted average remaining contractual life (Year) 2 years 1 month 6 days    
Exercise Price Range 2 [Member]      
Options outstanding (in shares) 553,066    
Exercise price, lower (in dollars per share) $ 90.62    
Exercise price, upper (in dollars per share) 106.48    
Weighted average exercise price (in dollars per share) $ 92.79    
Weighted average remaining contractual life (Year) 4 years