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Note 2 - Investment Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
One year or less, available-for-sale-securities, amortized cost $ 246  
One year or less, available-for-sale-securities, fair value 247  
Over one through five years, available-for-sale securities, amortized cost 2,376  
Over one through five years, available-for-sale securities, fair value 2,392  
Over five through ten years, available-for-sale securities, amortized cost 14,048  
Over five through ten years, available-for-sale securities, fair value 14,229  
Greater than 10 years, available-for-sale securities, amortized cost 31,613  
Greater than 10 years, available-for-sale securities, fair value 31,797  
Available-for-sale securities, amortized cost 48,283 $ 53,060
Available-for-sale securities, fair value $ 48,665 $ 52,975 [1]
[1] Derived from consolidated audited financial statements.