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Note 3 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available for sale, amortized cost | $ 108,715 | $ 102,455
Securities available for sale, gross unrealized gains | 51 | 300
Securities available for sale, gross unrealized losses | (3,889) | (1,630)
Securities available for sale | 104,877 | 101,125
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available for sale, amortized cost | 16,835 | 13,622
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses | (383) | (149)
Securities available for sale | 16,452 | 13,473
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available for sale, amortized cost | 91,880 | 88,833
Securities available for sale, gross unrealized gains | 51 | 300
Securities available for sale, gross unrealized losses | (3,506) | (1,481)
Securities available for sale | $ 88,425 | $ 87,652

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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