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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale, due within one year, amortized cost | $ 29,974 |  |
Securities available for sale, due within one year, fair value | 29,959 |  |
Securities available for sale, due after one year but within five years, amortized cost | 7,563 |  |
Securities available for sale, due after one year but within five years, fair value | 7,646 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 99,038 |  |
Securities available for sale, due after five years but within ten years, fair value | 98,852 |  |
Securities available for sale, due after ten years, amortized cost | 4,047 |  |
Securities available for sale, due after ten years, fair value | 4,039 |  |
Securities available for sale, single maturity date, amortized cost | 140,622 |  |
Securities available for sale, single maturity date, fair value | 140,496 |  |
Total debt securities available for sale, amortized cost | 165,049 |  |
Total debt securities available for sale, fair value | 164,137 |  |
Securities held to maturity, due within one year, amortized cost |  |  |
Securities held to maturity, due within one year, fair value |  |  |
Securities held to maturity, due after one year but within five years, amortized cost | 25,115 |  |
Securities held to maturity, due after one year but within five years, fair value | 24,987 |  |
Securities held to maturity, due after five years but within ten years, amortized cost |  |  |
Securities held to maturity, due after five years but within ten years, fair value |  |  |
Securities held to maturity, due after ten years, amortized cost |  |  |
Securities held to maturity, due after ten years, fair value |  |  |
Total debt securities held to maturity, amortized cost | 25,115 | $ 25,149 | [1]
Total debt securities held to maturity, fair value | 24,987 | $ 25,084 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale, no single maturity date, amortized cost | 24,427 |  |
Securities available for sale, no single maturity date, fair value | $ 23,641 |  |
[1] | Derived from audited financial statements

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