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Note 13 - Stock-based Compensation - Options Outstanding by Exercise Price Range (Details) - $ / shares
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Options outstanding (in shares) 833,190 631,242 588,534
Options outstanding, weighted average exercise price (in dollars per share) $ 81.96    
Options outstanding, weighted average remaining contractual life (Year) 3 years 7 months 6 days    
Exercise Price Range 1 [Member]      
Options outstanding (in shares) 53.94    
Options outstanding, exercise price, lower range (in dollars per share) $ 0    
Options outstanding, exercise price, upper range (in dollars per share) 71.64    
Options outstanding, weighted average exercise price (in dollars per share) $ 59.55    
Options outstanding, weighted average remaining contractual life (Year) 2 years 3 months 18 days    
Exercise Price Range 2 [Member]      
Options outstanding (in shares) 90.62    
Options outstanding, exercise price, lower range (in dollars per share) $ 0    
Options outstanding, exercise price, upper range (in dollars per share) 106.48    
Options outstanding, weighted average exercise price (in dollars per share) $ 92.81    
Options outstanding, weighted average remaining contractual life (Year) 4 years 3 months 18 days