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Note 2 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale debt securities |  |  |
Securities available for sale, due within one year, amortized cost | $ 29,910 |  |
Securities available for sale, due within one year, fair value | 29,888 |  |
Securities available for sale, due after one year but within five years, amortized cost | 11,547 |  |
Securities available for sale, due after one year but within five years, fair value | 11,644 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 86,662 |  |
Securities available for sale, due after five years but within ten years, fair value | 86,226 |  |
Securities available for sale, due after ten years, amortized cost | 785 |  |
Securities available for sale, due after ten years, fair value | 782 |  |
Securities available for sale, single maturity date, amortized cost | 128,904 |  |
Securities available for sale, single maturity date, fair value | 128,540 |  |
Total debt securities available for sale, amortized cost | 165,167 |  |
Total debt securities available for sale, fair value | 163,593 |  |
Held-to-maturity debt securities |  |  |
Securities held to maturity, due within one year, amortized cost | 25,047 |  |
Securities held to maturity, due within one year, fair value | 24,979 |  |
Securities held to maturity, due after one year but within five years, amortized cost |  |  |
Securities held to maturity, due after one year but within five years, fair value |  |  |
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 |  |  |
Securities held to maturity, amortized cost | 25,047 | $ 25,149 | [1]
Securities held to maturity, fair value | 24,979 | $ 25,084 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Available-for-sale debt securities |  |  |
Securities available for sale, no single maturity date, amortized cost | 36,263 |  |
Securities available for sale, no single maturity date, fair value | $ 35,053 |  |
[1] | Derived from audited financial statements

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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