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Note 22 - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Unit Activity [Line Items]    
Number of Restricted Units, Outstanding 468,681  
Number of Restricted Units, Granted 785,545  
Number of Restricted Units, Vested 270,952  
Number of Restricted Units, Forfeited 279,526  
Number of Restricted Units, Outstanding 703,748 468,681
Weighted-Average Grant Date Fair Values, Outstanding $ 12.21  
Weighted-Average Grant Date Fair Values, Granted 3.66 $ 9.20
Weighted-Average Grant Date Fair Values, Vested 12.39  
Weighted-Average Grant Date Fair Values, Forfeited 6.88  
Weighted-Average Grant Date Fair Values, Outstanding $ 4.72 $ 12.21