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Note 2 - Investment Securities - Held to Maturity Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities held to maturity, less than 12 months fair value   $ 3,533
Securities held to maturity, less than 12 months unrealized losses   (2)
Securities held to maturity, 12 months or longer fair value  
Securities held to maturity, 12 months or longer unrealized losses  
Securities held to maturity, total fair value   3,533
Securities held to maturity, unrealized losses $ 0 (2)
Corporate Debt Securities [Member]    
Securities held to maturity, less than 12 months fair value   3,533
Securities held to maturity, less than 12 months unrealized losses   (2)
Securities held to maturity, 12 months or longer fair value  
Securities held to maturity, 12 months or longer unrealized losses  
Securities held to maturity, total fair value   3,533
Securities held to maturity, unrealized losses $ (2)