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Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | $ 7,687 | $ 7,817
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (18) | (88)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 19,048 | 16,489
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (174) | (231)
Available-for-sale securities in continuous loss position, fair value | 26,735 | 24,306
Available-for-sale securities in continuous loss position, unrealized loss | (192) | (319)
US Government Agencies Debt Securities [Member] |  |
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 4,989 | 4,954
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (11) | (46)
Available-for-sale securities in continuous loss position, 12 months or more, fair value |  | 0
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss |  | 0
Available-for-sale securities in continuous loss position, fair value | 4,989 | 4,954
Available-for-sale securities in continuous loss position, unrealized loss | (11) | (46)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 2,698 | 2,863
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | (7) | (42)
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 10,151 | 10,550
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (71) | (170)
Available-for-sale securities in continuous loss position, fair value | 12,849 | 13,413
Available-for-sale securities in continuous loss position, unrealized loss | (78) | (212)
Corporate Debt Securities [Member] |  |
Note 2 - Investment Securities (Details) - Investment Securities in a Continuous Loss Position [Line Items] |  |
Available-for-sale securities in continuous loss position, less than 12 months, fair value | 0 | 0
Available-for-sale securities in continuous loss position, less than 12 months, unrealized loss | 0 | 0
Available-for-sale securities in continuous loss position, 12 months or more, fair value | 8,897 | 5,939
Available-for-sale securities in continuous loss position, 12 months or more, unrealized loss | (103) | (61)
Available-for-sale securities in continuous loss position, fair value | 8,897 | 5,939
Available-for-sale securities in continuous loss position, unrealized loss | $ (103) | $ (61)

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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