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Note 11 - Share Based Compensation and Employee Benefit Plans - Non-vested Restricted Stock Awards and RSU's (Details) - Restricted Stock [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Outstanding non-vested shares (in shares) 540,132  
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 25.71  
Granted (in shares) 306,590  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 40.46  
Vested (in shares) (267,588)  
Vested, weighted average grant date fair value (in dollars per share) $ 24.57  
Forfeited (in shares) (6,000)  
Forfeited, weighted average grant date fair value (in dollars per share) $ 33.62  
Outstanding non-vested shares (in shares) 573,134 540,132
Outstanding non-vested, weighted average remaining contractual life (Year) 8 years 219 days  
Outstanding non-vested, aggregate intrinsic value $ 20,402,823  
Outstanding non-vested, weighted average grant date fair value (in dollars per share) $ 34.07 $ 25.71
Expected to vest (in shares)   571,974
Expected to vest, weighted average remaining contractual life (Year) 8 years 219 days  
Expected to vest, aggregate intrinsic value $ 20,361,531