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Note 6 - Common Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 19, 2020
Dec. 31, 2021
Dec. 31, 2020
Jan. 04, 2020
Common Stock, No Par Value (in dollars per share)   $ 0 $ 0  
Stock Repurchase Program, Authorized Amount       $ 420,000
Stock Repurchased During Period, Shares (in shares) 14,000,000      
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01      
Stock Repurchased During Period, Price Per Share (in dollars per share) $ 30      
Stock Repurchased During Period, Value $ 420,000      
Percentage of Outstanding Shares Repurchased 32.67%      
Shares Buyback Equity Impact, Amount     $ (420,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)   1,100,000 1,800,000  
Proceeds from Issuance of Common Stock   $ 8,000 $ 10,300  
Common Stock [Member]        
Stock Repurchased During Period, Price Per Share (in dollars per share) $ 6.99      
Shares Buyback Equity Impact, Amount $ 97,900      
Retained Earnings [Member]        
Stock Repurchased During Period, Price Per Share (in dollars per share) $ 23.34      
Shares Buyback Equity Impact, Amount $ (322,100)   $ (322,140)  
Minimum [Member]        
Stock Repurchase Program, Purchase Price Per Share (in dollars per share)       $ 30.00
Shares Issued, Price Per Share (in dollars per share)   $ 3.27 $ 2.71  
Maximum [Member]        
Stock Repurchase Program, Purchase Price Per Share (in dollars per share)       $ 33.00
Shares Issued, Price Per Share (in dollars per share)   $ 15.00 $ 19.09