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Note 3 - Securities - Sales of Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities $ 4 $ 58 $ 156 $ 128
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (23) (116) (27)
Gain on investment securities, net 4 35 40 101
US Government Agencies Debt Securities [Member]        
Proceeds from sales of securities 1,107 13,326 20,505 27,252
US States and Political Subdivisions Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 4 30 156 81
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (71)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 19 37
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (23) (24)
Corporate Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 9 10
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (3)
Asset-backed Securities [Member]        
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities $ (45)