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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 42,838 | $ 42,349
Securities available for sale, less than 12 months, unrealized losses | (171) | (106)
Securities available for sale, 12 months or longer, fair value | 33,425 | 25,267
Securities available for sale, 12 months or longer, unrealized losses | (1,121) | (925)
Securities available for sale, total fair value | 76,263 | 67,616
Securities available for sale, total unrealized losses | (1,292) | (1,031)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 19,960 | 19,972
Securities available for sale, less than 12 months, unrealized losses | (10) | (16)
Securities available for sale, 12 months or longer, fair value |  |
Securities available for sale, 12 months or longer, unrealized losses |  |
Securities available for sale, total fair value | 19,960 | 19,972
Securities available for sale, total unrealized losses | (10) | (16)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  | 10,054
Securities available for sale, less than 12 months, unrealized losses |  | (10)
Securities available for sale, 12 months or longer, fair value |  |
Securities available for sale, 12 months or longer, unrealized losses |  |
Securities available for sale, total fair value |  | 10,054
Securities available for sale, total unrealized losses |  | (10)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 7,116 | 8,047
Securities available for sale, less than 12 months, unrealized losses | (62) | (55)
Securities available for sale, 12 months or longer, fair value | 18,081 | 2,314
Securities available for sale, 12 months or longer, unrealized losses | (447) | (52)
Securities available for sale, total fair value | 25,197 | 10,361
Securities available for sale, total unrealized losses | (509) | (107)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 15,762 | 4,276
Securities available for sale, less than 12 months, unrealized losses | (99) | (25)
Securities available for sale, 12 months or longer, fair value | 15,344 | 14,069
Securities available for sale, 12 months or longer, unrealized losses | (674) | (390)
Securities available for sale, total fair value | 31,106 | 18,345
Securities available for sale, total unrealized losses | $ (773) | (415)
Single Issue Trust Preferred Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  |
Securities available for sale, less than 12 months, unrealized losses |  |
Securities available for sale, 12 months or longer, fair value |  | 8,884
Securities available for sale, 12 months or longer, unrealized losses |  | (483)
Securities available for sale, total fair value |  | 8,884
Securities available for sale, total unrealized losses |  | $ (483)

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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