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Note 2 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 1,586 | $ 42,838
Securities available for sale, less than 12 months, unrealized losses | (3) | (171)
Securities available for sale, 12 months or longer, fair value | 21,316 | 33,425
Securities available for sale, 12 months or longer, unrealized losses | (463) | (1,121)
Securities available for sale, total fair value | 22,902 | 76,263
Securities available for sale, total unrealized losses | (466) | (1,292)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 1,068 |
Securities available for sale, less than 12 months, unrealized losses | (1) |
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 | 1,068 |
Securities available for sale, total unrealized losses | (1) |
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  | 19,960
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 |  | 19,960
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
Securities available for sale, less than 12 months, unrealized losses |  | (62)
Securities available for sale, 12 months or longer, fair value | 4,999 | 18,081
Securities available for sale, 12 months or longer, unrealized losses | (44) | (447)
Securities available for sale, total fair value | 4,999 | 25,197
Securities available for sale, total unrealized losses | (44) | (509)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 518 | 15,762
Securities available for sale, less than 12 months, unrealized losses | (2) | (99)
Securities available for sale, 12 months or longer, fair value | 16,317 | 15,344
Securities available for sale, 12 months or longer, unrealized losses | (419) | (674)
Securities available for sale, total fair value | 16,835 | 31,106
Securities available for sale, total unrealized losses | $ (421) | $ (773)

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=118939692&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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