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Note 2 - Debt Securities - Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities held to maturity, amortized cost $ 25,082 $ 25,149 [1]
Securities held to maturity, unrealized gains
Securities held to maturity, unrealized losses (102) (65)
Securities held to maturity, fair value 24,980 25,084
US Government Agencies Debt Securities [Member]    
Securities held to maturity, amortized cost 17,913 17,937
Securities held to maturity, unrealized gains
Securities held to maturity, unrealized losses (74) (49)
Securities held to maturity, fair value 17,839 17,888
Corporate Debt Securities [Member]    
Securities held to maturity, amortized cost 7,169 7,212
Securities held to maturity, unrealized gains
Securities held to maturity, unrealized losses (28) (16)
Securities held to maturity, fair value $ 7,141 $ 7,196
[1] Derived from audited financial statements