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Note 2 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 66,476 | $ 42,349
Securities available for sale, less than 12 months, unrealized losses | (964) | (106)
Securities available for sale, 12 months or longer, fair value | 23,616 | 25,267
Securities available for sale, 12 months or longer, unrealized losses | (1,152) | (925)
Securities available for sale, total fair value | 90,092 | 67,616
Securities available for sale, total unrealized losses | (2,116) | (1,031)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 10,018 | 10,054
Securities available for sale, less than 12 months, unrealized losses | (10) | (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 | 10,018 | 10,054
Securities available for sale, total unrealized losses | (10) | (10)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 19,942 | 19,972
Securities available for sale, less than 12 months, unrealized losses | (5) | (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 | 19,942 | 19,972
Securities available for sale, total unrealized losses | (5) | (16)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 28,497 | 8,047
Securities available for sale, less than 12 months, unrealized losses | (795) | (55)
Securities available for sale, 12 months or longer, fair value | 1,575 | 2,314
Securities available for sale, 12 months or longer, unrealized losses | (100) | (52)
Securities available for sale, total fair value | 30,072 | 10,361
Securities available for sale, total unrealized losses | (895) | (107)
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 | 8,991 | 8,884
Securities available for sale, 12 months or longer, unrealized losses | (379) | (483)
Securities available for sale, total fair value | 8,991 | 8,884
Securities available for sale, total unrealized losses | (379) | (483)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 8,019 | 4,276
Securities available for sale, less than 12 months, unrealized losses | (154) | (25)
Securities available for sale, 12 months or longer, fair value | 13,050 | 14,069
Securities available for sale, 12 months or longer, unrealized losses | (673) | (390)
Securities available for sale, total fair value | 21,069 | 18,345
Securities available for sale, total unrealized losses | $ (827) | $ (415)

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
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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X
- 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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X
- 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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