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Note 20 - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Unit Activity [Line Items]      
Number of Restricted Units, Outstanding 774,545    
Number of Restricted Units, Granted 331,195    
Number of Restricted Units, Vested 395,577    
Number of Restricted Units, Forfeited 58,619    
Number of Restricted Units, Outstanding 651,544 774,545  
Weighted-Average Grant Date Fair Values, Outstanding $ 19.13    
Weighted-Average Grant Date Fair Values, Granted 13.85 $ 14.86 $ 24.16
Weighted-Average Grant Date Fair Values, Vested 18.89    
Weighted-Average Grant Date Fair Values, Forfeited 19.40    
Weighted-Average Grant Date Fair Values, Outstanding $ 16.57 $ 19.13