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Note 13 - Stock Repurchase Programs (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended 89 Months Ended
Aug. 05, 2022
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Stock Repurchase Program, Authorized Amount $ 500,000 $ 250,000        
Stock Repurchase Program, Period in Force (Year) 24 months 24 years        
Treasury Stock, Shares, Acquired (in shares)     2,722,007      
Treasury Stock, Value, Acquired, Cost Method     $ 345,840 $ 125,992    
Payments for Repurchase of Common Stock     $ 345,840 $ 125,992 $ (0) $ 777,379
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)           $ 66.17
Treasury Stock [Member]            
Treasury Stock, Shares, Acquired (in shares)     2,722,007 350,000    
Treasury Stock, Value, Acquired, Cost Method     $ 345,840 $ 125,992    
Shares Acquired Under Stock Repurchases Program, Shares (in shares)       350,000 0 11,748,713