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Note 4 - Securities (Details) - Sales of Securities - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Note 4 - Securities (Details) - Sales of Securities [Line Items]    
Proceeds from sales of securities $ 19,934 $ 25,215
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities (25) (9)
Gross realized gains on sales of securities 119 224
Gain on investment securities, net 94 215
US States and Political Subdivisions Debt Securities [Member]    
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities 72 32
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities   (9)
Gross realized gains on sales of securities   13
Corporate Debt Securities [Member]    
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities (25)  
Gross realized gains on sales of securities 42 82
Commercial Mortgage Backed Securities [Member]    
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities 4 4
Asset-backed Securities [Member]    
Gross realized gains on sales of securities:    
Gross realized losses on sales of securities $ 1 $ 93