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Note 4 - Stock Options and Restricted Stock Awards (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 15.9   $ 15.9  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 6 months  
Share-Based Payment Arrangement, Option [Member] | Selling, General and Administrative Expenses [Member]        
Share-Based Payment Arrangement, Expense 5.5 $ 6.0 $ 19.6 $ 19.0
Restricted Stock [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 20.0   $ 20.0  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 6 months