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Note 8 - Stock-based Compensation - Full Value Awards (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Non-vested RSU's, beginning balance (in shares) 488,779  
Non-vested RSU's, beginning balance (in dollars per share) $ 18.99  
Granted RSU's (in shares) 276,900 337,175
Granted RSU's (in dollars per share) $ 28.21  
Vested RSU's (in shares) (242,917)  
Vested RSU's (in dollars per share) $ 21.93  
Forfeited RSU's (in shares) (14,680)  
Forfeited RSU's (in dollars per share) $ 21.77  
Non-vested RSU's, ending balance (in shares) 508,082  
Non-vested RSU's, ending balance (in dollars per share) $ 22.53  
Vested RSU's but unissued at December 31, 2016 (in shares) 270,017  
Vested but unissued at March 31, 2017 (in dollars per share) $ 22.33