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Note 5 - Securities (Details) - Sales of Securities - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Note 5 - Securities (Details) - Sales of Securities [Line Items]        
Proceeds from sales of securities $ 10,697 $ 32,099 $ 35,912 $ 68,785
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 86 207 311 534
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (25) (246) (35) (818)
Gain (loss) on investment securities, net 61 (39) 276 (284)
US States and Political Subdivisions Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 37 14 70 171
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities   (69)   (159)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities 49 63 62 68
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities   (13) (9) (482)
Corporate Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities   85 82 227
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities   (8)   (8)
Commercial Mortgage Backed Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities   5 4 5
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities   (31)   (32)
Asset-backed Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities   40 93 63
Gross realized losses on sales of securities:        
Gross realized losses on sales of securities (24) (10) (25) (23)
US Government Agencies Debt Securities [Member]        
Gross realized gains on sales of securities:        
Gross realized gains on sales of securities $ (1) $ (115) $ (1) $ (114)