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Note 4 - Stock Options and Restricted Stock Awards (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share-Based Payment Arrangement, Option [Member]    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 19.7  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 6 months  
Share-Based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]    
Share-Based Payment Arrangement, Expense $ 13.7 $ 14.1
Restricted Stock [Member]    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 25.0  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 6 months