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Note 9 - Equity - Restricted Stock Units (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
EQUITY      
Shares delivered per unit awarded 1    
Fair value of awards $ 28.9 $ 19.7 $ 11.0
Restricted Stock Units      
EQUITY      
Vesting period 3 years    
Delivery period 30 days    
Unrecognized compensation cost $ 5.9    
Weighted-average period for recognition 1 year 8 months 12 days    
Restricted Stock Units | Class A Common Stock      
EQUITY      
Fair value of awards $ 4.2    
Outstanding, fair value 6.7    
Restricted Stock Units | Class B Common Stock      
EQUITY      
Fair value of awards 0.6    
Outstanding, fair value $ 0.8