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Note 3 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity, amortized cost | $ 17,353 | $ 17,581
Securities held to maturity, gross unrecognized gains | 558 | 533
Securities held to maturity, gross unrecognized losses | (102) | (35)
Securities held to maturity | 17,809 | 18,079
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, amortized cost | 17,350 | 17,577
Securities held to maturity, gross unrecognized gains | 558 | 533
Securities held to maturity, gross unrecognized losses | (102) | (35)
Securities held to maturity | 17,806 | 18,075
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities held to maturity, amortized cost | 3 | 4
Securities held to maturity, gross unrecognized gains |  |
Securities held to maturity, gross unrecognized losses |  |
Securities held to maturity | $ 3 | $ 4

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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