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Note 2 - Investment Securities (Details) - USD ($) | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Available-for-sale securities, amortized cost |  | $ 12,170,000 | $ 13,625,000
Available-for-sale securities, gross unrealized losses |  | 21,000 |
Available-for-sale securities, gross unrealized gains |  | (52,000) | (212,000)
Available-for-sale securities |  | 12,139,000 | 13,413,000
Corporate Debt Securities [Member] |  |  |
Available-for-sale securities, amortized cost |  | 9,000,000 | 9,000,000
Available-for-sale securities, gross unrealized losses |  |  | 71,000
Available-for-sale securities, gross unrealized gains |  | (102,000) | (61,000)
Available-for-sale securities |  | 8,898,000 | 9,010,000
Subordinated Notes [Member] |  |  |
Available-for-sale securities, amortized cost |  | 2,000,000 | 2,000,000
Available-for-sale securities, gross unrealized losses |  |  |
Available-for-sale securities, gross unrealized gains |  |  |
Available-for-sale securities |  | 2,000,000 | 2,000,000
US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities, amortized cost |  |  | 5,000,000
Available-for-sale securities, gross unrealized losses |  |  |
Available-for-sale securities, gross unrealized gains |  |  | (46,000)
Available-for-sale securities |  |  | 4,954,000
Available-for-sale securities, amortized cost |  | 23,170,000 | 29,625,000
Available-for-sale securities, gross unrealized losses |  | 21,000 | 71,000
Available-for-sale securities, gross unrealized gains |  | (154,000) | (319,000)
Available-for-sale securities | $ 23,037,000 | $ 23,037,000 | $ 29,377,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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