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Note 3 - Securities - Sales of Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities $ 104 $ 70 $ 260 $ 198
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (103) (32) (219) (59)
Gain on investment securities, net 1 38 41 139
US Government Agencies Debt Securities [Member]        
Proceeds from sales of securities 7,062 20,640 27,567 47,892
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (43) (43)
US States and Political Subdivisions Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 104 31 260 112
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (1) (10) (72) (10)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 16 53
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (40) (22) (40) (46)
Corporate Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 20 30
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (3)
Commercial Mortgage Backed Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 3 3
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (19) (19)
Asset-backed Securities [Member]        
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities $ (45)