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Note 3 - Securities - Securities Held to Maturity With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Less Than 12 Months - Fair Value | $ 1,792 | $ 362
Less Than 12 Months - Unrecognized Loss | (7) | (2)
12 Months or More - Fair Value | 1,437 | 1,502
12 Months or More - Unrecognized Loss | (95) | (33)
Fair Value | 3,229 | 1,864
Unrecognized Loss | (102) | (35)
US States and Political Subdivisions Debt Securities [Member] |  |
Less Than 12 Months - Fair Value | 1,792 | 362
Less Than 12 Months - Unrecognized Loss | (7) | (2)
12 Months or More - Fair Value | 1,437 | 1,502
12 Months or More - Unrecognized Loss | (95) | (33)
Fair Value | 3,229 | 1,864
Unrecognized Loss | $ (102) | $ (35)

X
- 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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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized 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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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