Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits (Details Textual)

v3.10.0.1
Note 6 - Employee and Director Benefits (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2006
Share-based Compensation, Total $ 244,000 $ 285,000 $ 482,000 $ 622,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 10.95 $ 11.84  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 1,695,000   $ 1,695,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 146 days    
Restricted Stock [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 811,000   $ 811,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 292 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
The 2009 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,550,000   5,550,000