Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits (Details Textual)

v3.8.0.1
Note 6 - Employee and Director Benefits (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation $ 294,000 $ 291,000 $ 916,000 $ 931,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 11.83 $ 5.95
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 2,100,000   $ 2,100,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 255 days  
Restricted Stock [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 543,000   $ 543,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 73 days  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years  
The 2005 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,150,000   6,150,000  
The 2009 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,550,000   5,550,000