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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

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