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Note 5 - Securities - Securities Held-to-maturity (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, AmortizedCosts | $ 3,934,000 | $ 13,909,000
Securities held-to-maturity, Gross Unrealized Gains | 401,000 | 288,000
Securities held-to-maturity, Gross Unrealized Losses | 0 | 177,000
Securities held-to-maturity, Fair Values | 4,335,000 | 14,020,000
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, AmortizedCosts | 132,409,000 | 136,373,000
Securities held-to-maturity, Gross Unrealized Gains | 6,781,000 | 6,179,000
Securities held-to-maturity, Gross Unrealized Losses | 25,000 | 330,000
Securities held-to-maturity, Fair Values | 139,165,000 | 142,222,000
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, AmortizedCosts | 281,000 | 327,000
Securities held-to-maturity, Gross Unrealized Gains | 35,000 | 36,000
Securities held-to-maturity, Gross Unrealized Losses | 0 | 0
Securities held-to-maturity, Fair Values | 316,000 | 363,000
Corporate Debt Securities [Member] |  |
Securities held-to-maturity, AmortizedCosts | 1,423,000 | 1,419,000
Securities held-to-maturity, Gross Unrealized Gains | 39,000 | 10,000
Securities held-to-maturity, Gross Unrealized Losses | 0 | 2,000
Securities held-to-maturity, Fair Values | 1,462,000 | 1,427,000
Securities held-to-maturity, AmortizedCosts | 138,047,000 | 152,028,000
Securities held-to-maturity, Gross Unrealized Gains | 7,256,000 | 6,513,000
Securities held-to-maturity, Gross Unrealized Losses | 25,000 | 509,000
Securities held-to-maturity, Fair Values | $ 145,278,000 | $ 158,032,000

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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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