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Note 4 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 11,002 | $ 17,922
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (580) | (209)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 8,428 | 3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (436) | (93)
Available-for-sale securities in continuous loss position, fair value | 19,430 | 21,028
Available-for-sale securities in continuous loss position, unrealized loss | (1,016) | (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 | 3,513 | 4,118
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (69) | (13)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 2,716 | 3,106
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (148) | (93)
Available-for-sale securities in continuous loss position, fair value | 6,229 | 7,224
Available-for-sale securities in continuous loss position, unrealized loss | (217) | (106)
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 7,489 | 13,804
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (511) | (196)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 5,712 |
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (288) |
Available-for-sale securities in continuous loss position, fair value | 13,201 | 13,804
Available-for-sale securities in continuous loss position, unrealized loss | $ (799) | $ (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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