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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Due in one year or less, available for sale, amortized cost  
Due in one year or less, available for sale, fair value  
Due in one year or less, held to maturity, amortized cost 2,416  
Due in one year or less, held to maturity, fair value 2,134  
Due in over one to five years, available for sale, amortized cost 16,835  
Due in over one to five years, available for sale, fair value 16,452  
Due in over one to five years, held to maturity, amortized cost 5,448  
Due in over one to five years, held to maturity, fair value 5,877  
Due in over five to ten years, available for sale, amortized cost  
Due in over five to ten years, available for sale, fair value  
Due in over five to ten years, held to maturity, amortized cost 7,094  
Due in over five to ten years, held to maturity, fair value 7,365  
Due after ten years, available for sale, amortized cost  
Due after ten years, available for sale, fair value  
Due after ten years, held to maturity, amortized cost 2,258  
Due after ten years, held to maturity, fair value 2,159  
Agency mortgage-backed securities, residential, available for sale, amortized cost 91,880  
Agency mortgage-backed securities, residential, available for sale, fair value 88,425  
Agency mortgage-backed securities, residential, held to maturity, amortized cost 3  
Agency mortgage-backed securities, residential, held to maturity, fair value 3  
Total debt securities, available for sale, amortized cost 108,715 $ 102,455
Total debt securities, available for sale, fair value 104,877 101,125
Total debt securities, held to maturity, amortized cost 17,219 17,581
Total debt securities, held to maturity, fair value $ 17,538 $ 18,079