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Note 4 - Stock Options and Restricted Stock Awards (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 15.2   $ 15.2  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 3 months 18 days  
Share-Based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]        
Share-Based Payment Arrangement, Expense 4.8 $ 5.3 $ 26.8 $ 24.9
Restricted Stock [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 16.7   $ 16.7  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 4 months 24 days