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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
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 | 926 |
Due in one year or less, held to maturity, fair value | 927 |
Due in over one to five years, available for sale, amortized cost | 16,677 |
Due in over one to five years, available for sale, fair value | 16,689 |
Due in over one to five years, held to maturity, amortized cost | 6,431 |
Due in over one to five years, held to maturity, fair value | 6,601 |
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 | 8,230 |
Due in over five to ten years, held to maturity, fair value | 8,593 |
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 |  |
Due after ten years, held to maturity, fair value |  |
Agency mortgage-backed securities, residential, available for sale, amortized cost | 94,310 |
Agency mortgage-backed securities, residential, available for sale, fair value | 93,592 |
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 | 110,987 | $ 104,867
Total debt securities, available for sale, fair value | 110,281 | 102,164
Total debt securities, held to maturity, amortized cost | 15,590 | 15,816
Total debt securities, held to maturity, fair value | $ 16,124 | $ 16,234

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