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Note 5 - Securities (Details) - Fair Value and Associated Unrealized Losses on Investments - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value $ 46,766 $ 31,006
Available-for-sale securities, less than 12 months, unrealized losses (499) (166)
Available-for-sale securities, 12 months or more, fair value 12,585 22,884
Available-for-sale securities, 12 months or more, unrealized losses (280) (476)
Available-for-sale securities, fair value 59,351 53,890
Available-for-sale securities, unrealized losses (779) (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 6,284 3,952
Available-for-sale securities, less than 12 months, unrealized losses (60) (34)
Available-for-sale securities, 12 months or more, fair value 358 2,078
Available-for-sale securities, 12 months or more, unrealized losses (5) (20)
Available-for-sale securities, fair value 6,642 6,030
Available-for-sale securities, unrealized losses (65) (54)
Held-to-maturity securities:    
Held-to-maturity securities, less than 12 months, fair value 7,829 1,556
Held-to-maturity securities, less than 12 months, unrealized losses (182) (14)
Held-to-maturity securities, 12 months or more, fair value 4,679 12,726
Held-to-maturity securities, 12 months or more, unrealized losses (310) (386)
Held-to-maturity securities, fair value 12,508 14,282
Held-to-maturity securities, unrealized losses (492) (400)
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 14,174 10,193
Available-for-sale securities, less than 12 months, unrealized losses (155) (66)
Available-for-sale securities, 12 months or more, fair value 3,629 5,365
Available-for-sale securities, 12 months or more, unrealized losses (93) (103)
Available-for-sale securities, fair value 17,803 15,558
Available-for-sale securities, unrealized losses (248) (169)
Corporate Debt Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 18,600 7,058
Available-for-sale securities, less than 12 months, unrealized losses (232) (36)
Available-for-sale securities, 12 months or more, fair value 3,478 6,542
Available-for-sale securities, 12 months or more, unrealized losses (21) (97)
Available-for-sale securities, fair value 22,078 13,600
Available-for-sale securities, unrealized losses (253) (133)
Commercial Mortgage Backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 5,040 4,912
Available-for-sale securities, less than 12 months, unrealized losses (50) (14)
Available-for-sale securities, 12 months or more, fair value 1,539 1,542
Available-for-sale securities, 12 months or more, unrealized losses (52) (59)
Available-for-sale securities, fair value 6,579 6,454
Available-for-sale securities, unrealized losses (102) (73)
Asset-backed Securities [Member]    
Available-for-sale securities:    
Available-for-sale securities, less than 12 months, fair value 2,668 4,891
Available-for-sale securities, less than 12 months, unrealized losses (2) (16)
Available-for-sale securities, 12 months or more, fair value 3,581 6,088
Available-for-sale securities, 12 months or more, unrealized losses (109) (181)
Available-for-sale securities, fair value 6,249 10,979
Available-for-sale securities, unrealized losses $ (111) $ (197)