Annual report pursuant to Section 13 and 15(d)

Note 13 - Employee and Director Benefits (Details Textual)

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Note 13 - Employee and Director Benefits (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Mar. 23, 2009
Share-based Payment Arrangement, Noncash Expense, Total $ 1,100,000 $ 851,000 $ 1,170,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 12.40 $ 12.76 $ 11.82    
Postemployment Benefits, Period Expense $ 1,700,000 $ 1,500,000 $ 1,400,000    
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,300,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 3 months 18 days        
Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,400,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 6 months        
The 2009 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,550,000 2,550,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,202,060