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Note 3 - Securities - Securities Available-for-sale With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Less than 12 Months - Fair Value | $ 54,648 | $ 44,331
Less than 12 Months - Unrealized Loss | (1,338) | (531)
12 Months or More - Fair Value | 39,544 | 38,326
12 Months or More - Unrealized Loss | (1,715) | (1,099)
Fair Value | 94,192 | 82,657
Unrealized Loss | (3,053) | (1,630)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Less than 12 Months - Fair Value | 3,882 | 6,910
Less than 12 Months - Unrealized Loss | (126) | (97)
12 Months or More - Fair Value | 9,434 | 6,563
12 Months or More - Unrealized Loss | (110) | (52)
Fair Value | 13,316 | 13,473
Unrealized Loss | (236) | (149)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Less than 12 Months - Fair Value | 50,766 | 37,421
Less than 12 Months - Unrealized Loss | (1,212) | (434)
12 Months or More - Fair Value | 30,110 | 31,763
12 Months or More - Unrealized Loss | (1,605) | (1,047)
Fair Value | 80,876 | 69,184
Unrealized Loss | $ (2,817) | $ (1,481)

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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