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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Securities available for sale, amortized cost, due in one year or less | $ 21,718 |
Securities available for sale, fair value, due in one year or less | 21,608 |
Securities available for sale, amortized cost, due after one year through five years | 58,618 |
Securities available for sale, fair value, due after one year through five years | 57,178 |
Securities available for sale, amortized cost, due after five years through ten years | 31,003 |
Securities available for sale, fair value, due after five years through ten years | 30,385 |
Securities available for sale, amortized cost, due after ten years | 18,090 |
Securities available for sale, fair value, due after ten years | 17,938 |
Securities available for sale, amortized cost, single maturity | 129,429 |
Securities available for sale, fair value, single maturity | 127,109 |
Securities available for sale, amortized cost, Mortgage-backed securities and CMO | 132,067 |
Securities available for sale, fair value, Mortgage-backed securities and CMO | 126,104 |
Securities available for sale, amortized cost | 261,496 | $ 273,878
Securities available for sale, fair value | 253,213 | $ 271,172
Debt Securities [Member] |  |
Securities available for sale, amortized cost | 261,496 |
Securities available for sale, fair value | $ 253,213 |

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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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