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Note 9 - Equity - Restricted Stock (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
EQUITY      
Fair value of awards $ 28.9 $ 19.7 $ 11.0
Restricted Stock | Minimum      
EQUITY      
Vesting period 1 year    
Restricted Stock | Maximum      
EQUITY      
Vesting period 3 years 6 months    
Restricted Stock | Class A Common Stock      
EQUITY      
Fair value of awards $ 20.7    
Outstanding, fair value 3.2    
Restricted Stock | Class B Common Stock      
EQUITY      
Fair value of awards 3.4    
Outstanding, fair value 0.3    
Restricted Stock | Executives and Employees      
EQUITY      
Unrecognized compensation cost $ 2.6    
Weighted-average period for recognition 1 year 10 months 24 days