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Note 4 - Securities (Details) - Fair Value and Associated Unrealized Losses on Investments - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value $ 54,959 $ 31,006
Available-for-sale securities, less than 12 months, unrealized losses (515) (166)
Available-for-sale securities, 12 months or more, fair value 9,877 22,884
Available-for-sale securities, 12 months or more, unrealized losses (233) (476)
Available-for-sale securities, fair value 64,836 53,890
Available-for-sale securities, unrealized losses (748) (642)
US Government Agencies Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, 12 months or more, fair value   1,269
Available-for-sale securities, 12 months or more, unrealized losses   (16)
Available-for-sale securities, fair value   1,269
Available-for-sale securities, unrealized losses   (16)
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 7,682 3,952
Available-for-sale securities, less than 12 months, unrealized losses (39) (34)
Available-for-sale securities, 12 months or more, fair value   2,078
Available-for-sale securities, 12 months or more, unrealized losses   (20)
Available-for-sale securities, fair value 7,682 6,030
Available-for-sale securities, unrealized losses (39) (54)
Held-to-maturity securities:    
Held-to-maturity securities, less than 12 months, fair value 1,513 1,556
Held-to-maturity securities, less than 12 months, unrealized losses (63) (14)
Held-to-maturity securities, 12 months or more, fair value 4,831 12,726
Held-to-maturity securities, 12 months or more, unrealized losses (157) (386)
Held-to-maturity securities, fair value 6,344 14,282
Held-to-maturity securities, unrealized losses (220) (400)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 16,279 10,193
Available-for-sale securities, less than 12 months, unrealized losses (210) (66)
Available-for-sale securities, 12 months or more, fair value 4,931 5,365
Available-for-sale securities, 12 months or more, unrealized losses (60) (103)
Available-for-sale securities, fair value 21,210 15,558
Available-for-sale securities, unrealized losses (270) (169)
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 18,707 7,058
Available-for-sale securities, less than 12 months, unrealized losses (191) (36)
Available-for-sale securities, 12 months or more, fair value   6,542
Available-for-sale securities, 12 months or more, unrealized losses   (97)
Available-for-sale securities, fair value 18,707 13,600
Available-for-sale securities, unrealized losses (191) (133)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 7,557 4,912
Available-for-sale securities, less than 12 months, unrealized losses (62) (14)
Available-for-sale securities, 12 months or more, fair value 1,516 1,542
Available-for-sale securities, 12 months or more, unrealized losses (72) (59)
Available-for-sale securities, fair value 9,073 6,454
Available-for-sale securities, unrealized losses (134) (73)
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 4,734 4,891
Available-for-sale securities, less than 12 months, unrealized losses (13) (16)
Available-for-sale securities, 12 months or more, fair value 3,430 6,088
Available-for-sale securities, 12 months or more, unrealized losses (101) (181)
Available-for-sale securities, fair value 8,164 10,979
Available-for-sale securities, unrealized losses $ (114) $ (197)