Annual report pursuant to Section 13 and 15(d)

Note 14 - Employee and Director Benefits (Details Textual)

v3.8.0.1
Note 14 - Employee and Director Benefits (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 23, 2009
Dec. 31, 2006
Dec. 31, 2005
Share-based Compensation $ 1,170,000 $ 1,198,000 $ 1,265,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,478,644          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.82 $ 6 $ 4.20      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,973,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 182 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 315,000 $ 1,908,000 $ 242,000      
Postemployment Benefits, Period Expense 1,419,000 $ 1,294,000 $ 1,080,000      
Restricted Stock [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 473,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year          
The 2005 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         6,150,000 3,150,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years          
The 2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,550,000     2,550,000