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Note 11 - Non-vested Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Non-vested at January 1, 2015 (in shares) 2,038,064  
Non-vested at January 1, 2015 (in dollars per share) $ 11.48  
Granted (in shares) 484,838  
Granted (in dollars per share) $ 11.27 $ 15.86
Vested (in shares) (592,529)  
Vested (in dollars per share) $ 8.63  
Forfeited (in shares) (10,500)  
Forfeited (in dollars per share) $ 13.57  
Non-vested at December 31, 2015 (in shares) 1,919,873 2,038,064
Non-vested at December 31, 2015 (in dollars per share) $ 12.30 $ 11.48