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Note 4 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities, amortized cost | $ 41,527 | $ 25,830
Available-for-sale securities, gross unrealized gains | 26 | 48
Available-for-sale securities, gross unrealized losses | (1,289) | (302)
Available-for-sale securities | 40,264 | 25,576
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, amortized cost | 21,530 | 7,330
Available-for-sale securities, gross unrealized gains | 1 |
Available-for-sale securities, gross unrealized losses | (296) | (106)
Available-for-sale securities | 21,235 | 7,224
Corporate Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 14,000 | 14,000
Available-for-sale securities, gross unrealized gains |  |
Available-for-sale securities, gross unrealized losses | (993) | (196)
Available-for-sale securities | 13,007 | 13,804
Subordinated Notes [Member] |  |
Available-for-sale securities, amortized cost | 4,500 | 4,500
Available-for-sale securities, gross unrealized gains | 25 | 48
Available-for-sale securities, gross unrealized losses |  |
Available-for-sale securities | 4,525 | $ 4,548
US Treasury Securities [Member] |  |
Available-for-sale securities, amortized cost | 1,497 |
Available-for-sale securities, gross unrealized gains |  |
Available-for-sale securities, gross unrealized losses |  |
Available-for-sale securities | $ 1,497 |

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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