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Note 2 - Investment Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Less than one year, available-for-sale securities, amortized cost $ 250  
Less than one year, available-for-sale securities, fair value 248  
Over one through five years, available-for-sale securities, amortized cost 2,462  
Over one through five years, available-for-sale securities, fair value 2,401  
Over five through ten years, available-for-sale securities, amortized cost 14,010  
Over five through ten years, available-for-sale securities, fair value 13,797  
Greater than 10 years, available-for-sale securities, amortized cost 30,448  
Greater than 10 years, available-for-sale securities, fair value 29,258  
Available-for-sale securities, amortized cost 47,170 $ 55,523
Available-for-sale securities, fair value $ 45,704 $ 55,344 [1]
[1] Derived from consolidated audited financial statements.