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Note 2 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale securities in continuous loss position, fair value $ 12,455 $ 15,286
Available-for-sale securities in continuous loss position, unrealized loss (123) (231)
Available-for-sale securities in continuous loss position, less than 12 months, fair value 12,455 5,969
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (123) (144)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 9,317
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss (87)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities in continuous loss position, fair value 3,501 9,325
Available-for-sale securities in continuous loss position, unrealized loss (77) (192)
Available-for-sale securities in continuous loss position, less than 12 months, fair value 3,501 5,969
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (77) (144)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 3,356
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss (48)
Corporate Debt Securities [Member]    
Available-for-sale securities in continuous loss position, fair value 8,954 5,961
Available-for-sale securities in continuous loss position, unrealized loss (46) (39)
Available-for-sale securities in continuous loss position, less than 12 months, fair value 8,954
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (46)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 5,961
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss $ (39)