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Note 2 - Investment Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Less than one year, available-for-sale securities, amortized cost  
Less than one year, available-for-sale securities, fair value  
Over one through five years, available-for-sale securities, amortized cost 3,095  
Over one through five years, available-for-sale securities, fair value 3,035  
Over five through ten years, available-for-sale securities, amortized cost 14,196  
Over five through ten years, available-for-sale securities, fair value 14,048  
Greater than 10 years, available-for-sale securities, amortized cost 31,784  
Greater than 10 years, available-for-sale securities, fair value 30,832  
Available-for-sale securities, amortized cost 49,075 $ 55,523
Available-for-sale securities, fair value $ 47,915 $ 55,344 [1]
[1] Derived from consolidated audited financial statements.