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Note 4 - Securities - Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, amortized cost | $ 19,646 | $ 19,898
Securities held to maturity, gross unrecognized gains | 1,090 | 892
Securities held to maturity, gross unrecognized losses | (4) | (5)
Securities held to maturity | 20,732 | 20,785
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities held to maturity, amortized cost | 5 | 5
Securities held to maturity, gross unrecognized gains |  |
Securities held to maturity, gross unrecognized losses |  |
Securities held to maturity | 5 | 5
Securities held to maturity, amortized cost | 19,651 | 19,903
Securities held to maturity, gross unrecognized gains | 1,090 | 892
Securities held to maturity, gross unrecognized losses | (4) | (5)
Securities held to maturity | $ 20,737 | $ 20,790

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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