Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits (Details Textual)

v3.7.0.1
Note 6 - Employee and Director Benefits (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation $ 285,000 $ 297,000 $ 622,000 $ 640,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 11.84 $ 11.80
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 2,300,000   $ 2,300,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 255 days  
Restricted Stock [Member]        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     488,376  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     368,700  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 575,000   $ 575,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 182 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