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Note 9 - Full Value Awards (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Non-vested at December 31, 2015 (in shares) 415,909  
Non-vested at December 31, 2015 (in dollars per share) $ 18.10  
Granted (in shares) 337,175 314,520
Granted (in dollars per share) $ 19.85  
Vested (in shares) (235,335)  
Vested (in dollars per share) $ 18.71  
Forfeited (in shares) (900)  
Forfeited (in dollars per share) $ 19.43  
Non-vested at March 31, 2016 (in shares) 516,849  
Non-vested at March 31, 2016 (in dollars per share) $ 18.97  
Vested but unissued at March 31, 2016 (in shares) 280,450  
Vested but unissued at March 31, 2016 (in dollars per share) $ 19.28