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Note 3 - Debt Securities - Securities Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity, amortized cost | $ 25,013 | $ 25,149 | [1]
Securities held to maturity, unrealized gains |  |  |
Securities held to maturity, unrealized losses | (23) | (65) |
Securities held to maturity, fair value | 24,990 | 25,084 |
US Government Agencies Debt Securities [Member] |  |  |
Securities held to maturity, amortized cost | 17,887 | 17,937 |
Securities held to maturity, unrealized gains |  |  |
Securities held to maturity, unrealized losses | (20) | (49) |
Securities held to maturity, fair value | 17,867 | 17,888 |
Corporate Debt Securities [Member] |  |  |
Securities held to maturity, amortized cost | 7,126 | 7,212 |
Securities held to maturity, unrealized gains |  |  |
Securities held to maturity, unrealized losses | (3) | (16) |
Securities held to maturity, fair value | $ 7,123 | $ 7,196 |
[1] | Derived from audited financial statements

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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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 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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