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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2006
Share-based Compensation, Total $ 238,000 $ 337,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.91    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 1,847,000    
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 $ 841,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 219 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