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Note 3 - Securities - Securities Available-for-sale With Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value | $ 59,837 | $ 74,587
Unrealized Loss | (754) | (1,996)
Less than 12 Months - Fair Value | 59,837 | 74,587
Less than 12 Months - Unrealized Loss | (754) | (1,996)
12 Months or More - Fair Value |  |
12 Months or More - Unrealized Loss |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Fair Value | 13,642 | 10,544
Unrealized Loss | (47) | (80)
Less than 12 Months - Fair Value | 13,642 | 10,544
Less than 12 Months - Unrealized Loss | (47) | (80)
12 Months or More - Fair Value |  |
12 Months or More - Unrealized Loss |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Fair Value | 46,195 | 64,043
Unrealized Loss | (707) | (1,916)
Less than 12 Months - Fair Value | 46,195 | 64,043
Less than 12 Months - Unrealized Loss | (707) | (1,916)
12 Months or More - Fair Value |  |
12 Months or More - Unrealized Loss |  |

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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 twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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