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Note 2 - Investment Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value $ 2,863
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (42)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 3,683 10,550
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss (50) (170)
Available-for-sale securities in continuous loss position, fair value 3,683 13,413
Available-for-sale securities in continuous loss position, unrealized loss (50) (212)
Corporate Debt Securities [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value 2,992
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (8)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 5,945 5,939
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss (55) (61)
Available-for-sale securities in continuous loss position, fair value 8,937 5,939
Available-for-sale securities in continuous loss position, unrealized loss (63) (61)
US Government Agencies Debt Securities [Member]    
Available-for-sale securities in continuous loss position, less than 12 months, fair value   4,954
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  
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss  
Available-for-sale securities in continuous loss position, fair value   4,954
Available-for-sale securities in continuous loss position, unrealized loss   (46)
Available-for-sale securities in continuous loss position, less than 12 months, fair value 2,992 7,817
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss (8) (88)
Available-for-sale securities in continuous loss position, 12 months or more, fair value 9,628 16,489
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss (105) (231)
Available-for-sale securities in continuous loss position, fair value 12,620 24,306
Available-for-sale securities in continuous loss position, unrealized loss $ (113) $ (319)