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Note 2 - Available-for-sale Securities - Investment Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Available-for-sale securities in continuous loss position, fair value | $ 12,455 | $ 15,286
Available-for-sale securities in continuous loss position, unrealized loss | (123) | (231)
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 12,455 | 5,969
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (123) | (144)
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  | 9,317
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  | (87)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities in continuous loss position, fair value | 3,501 | 9,325
Available-for-sale securities in continuous loss position, unrealized loss | (77) | (192)
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 3,501 | 5,969
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (77) | (144)
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  | 3,356
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  | (48)
Corporate Debt Securities [Member] |  |
Available-for-sale securities in continuous loss position, fair value | 8,954 | 5,961
Available-for-sale securities in continuous loss position, unrealized loss | (46) | (39)
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 8,954 |
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (46) |
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  | 5,961
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  | $ (39)

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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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- 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 less than twelve months. + 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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