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Note 18 - Equity Incentive Plans - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance (in shares) 82,670 1,031,170 2,332,904  
Balance (in dollars per share) $ 23.37 $ 31.27 $ 32.34  
Balance (Year) 36 days 1 year 36 days 328 days 1 year 73 days
Balance $ 675 $ 1,211 $ 3,268 $ 1,388
Exercised (in shares) (46,790) (327,830) (214,580)  
Exercised (in dollars per share) $ 23.37 $ 23.37 $ 23.37  
Forfeited (in shares)   (620,670) (1,087,154)  
Forfeited (in dollars per share)   $ 36.50 $ 35.13  
Balance (in shares) 35,880 82,670 1,031,170 2,332,904
Balance (in dollars per share) $ 23.37 $ 23.37 $ 31.27 $ 32.34
Exercisable (in shares) 35,880      
Exercisable (in dollars per share) $ 23.37      
Exercisable (Year) 36 days      
Exercisable $ 675