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Note 5 - Securities (Details) - Sales of Securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Note 5 - Securities (Details) - Sales of Securities [Line Items]        
Proceeds from sales of securities $ 25,340 $ 13,036 $ 61,255 $ 81,820
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 177 143 487 677
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (40) (111) (74) (929)
Gain (loss) on investment securities, net 137 32 413 (252)
US States and Political Subdivisions Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 16 44 86 215
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (4) (50) (4) (209)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 49 7 111 75
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (2) (61) (12) (543)
Corporate Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 52 82 134 309
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities       (8)
Commercial Mortgage Backed Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 10   14 5
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities       (33)
Asset-backed Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 50 $ 10 142 73
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (30)   (53) (22)
US Government Agencies Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities $ (4)   $ (5) $ (114)