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Note 20 - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock Unit Activity [Line Items]      
Number of Restricted Units, Outstanding 651,544    
Number of Restricted Units, Granted 222,853    
Number of Restricted Units, Vested 399,527    
Number of Restricted Units, Forfeited 6,189    
Number of Restricted Units, Outstanding 468,681 651,544  
Weighted-Average Grant Date Fair Values, Outstanding $ 16.57    
Weighted-Average Grant Date Fair Values, Granted 9.20 $ 13.85 $ 14.86
Weighted-Average Grant Date Fair Values, Vested 17.56    
Weighted-Average Grant Date Fair Values, Forfeited 17.26    
Weighted-Average Grant Date Fair Values, Outstanding $ 12.21 $ 16.57