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Note 3 - Share-based Compensation (Details Textual)
$ in Millions
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2023
USD ($)
Restricted Stock Units (RSUs) [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ $ 69.1 $ 69.1 $ 69.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 8 months 12 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period | shares 102,141 120,798  
Performance Shares [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ $ 32.8 $ 32.8 $ 32.8
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   2 years 3 months 18 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period | shares 3,465 142,346