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Note 13 - Incentive Plans (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
May 31, 2020
Share-based Payment Arrangement, Expense $ 7.5 $ 6.5  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 62.8    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years 2 months 12 days    
The 2020 Equity Participation Plan [Member]      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)     10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 6,800,000