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Note 4 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 16,955 | $ 17,922
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (83) | (209)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 17,047 | 3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (1,206) | (93)
Available-for-sale securities in continuous loss position, fair value | 34,002 | 21,028
Available-for-sale securities in continuous loss position, unrealized loss | (1,289) | (302)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 16,955 | 4,118
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (83) | (13)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 4,040 | 3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (213) | (93)
Available-for-sale securities in continuous loss position, fair value | 20,995 | 7,224
Available-for-sale securities in continuous loss position, unrealized loss | (296) | (106)
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value |  | 13,804
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss |  | (196)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 13,007 |
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (993) |
Available-for-sale securities in continuous loss position, fair value | 13,007 | 13,804
Available-for-sale securities in continuous loss position, unrealized loss | $ (993) | $ (196)

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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 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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- 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 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)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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