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Note 10 - Stock-based Compensation - Stock Option Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 135 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Outstanding, option shares (in shares) 10,541    
Outstanding, weighted average exercise price (in dollars per share) $ 16.63    
Granted, option shares (in shares) 0   0
Granted, weighted average exercise price (in dollars per share) $ 0    
Exercised, option shares (in shares) 0 (1,743)  
Exercised, weighted average exercise price (in dollars per share) $ 0    
Forfeited, option shares (in shares) (332)    
Forfeited, weighted average exercise price (in dollars per share) $ 16.63    
Expired, option shares (in shares) 0    
Expired, weighted average exercise price (in dollars per share) $ 0    
Outstanding and exercisable, option shares (in shares) 10,209   10,209
Outstanding and exercisable, weighted average exercise price (in dollars per share) $ 16.63   $ 16.63
Outstanding and exercisable, weighted average remaining contractual term (Year) 3 years 8 months 19 days    
Outstanding and exercisable, aggregate intrinsic value $ 167,836   $ 167,836