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Note 3 - Debt Securities - Held to Maturity Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity, less than 12 months fair value |  | $ 25,084
Securities held to maturity, less than 12 months unrealized losses |  | (65)
Securities held to maturity, 12 months or longer fair value | 24,990 |
Securities held to maturity, 12 months or longer unrealized losses | (23) |
Securities held to maturity, total fair value | 24,990 | 25,084
Securities held to maturity, unrealized losses | (23) | (65)
US Government Agencies Debt Securities [Member] |  |
Securities held to maturity, less than 12 months fair value |  | 17,888
Securities held to maturity, less than 12 months unrealized losses |  | (49)
Securities held to maturity, 12 months or longer fair value | 17,867 |
Securities held to maturity, 12 months or longer unrealized losses | (20) |
Securities held to maturity, total fair value | 17,867 | 17,888
Securities held to maturity, unrealized losses | (20) | (49)
Corporate Debt Securities [Member] |  |
Securities held to maturity, less than 12 months fair value |  | 7,196
Securities held to maturity, less than 12 months unrealized losses |  | (16)
Securities held to maturity, 12 months or longer fair value | 7,123 |
Securities held to maturity, 12 months or longer unrealized losses | (3) |
Securities held to maturity, total fair value | 7,123 | 7,196
Securities held to maturity, unrealized losses | $ (3) | $ (16)

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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 of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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