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Note 10 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities, at fair value | $ 24,793 | $ 25,576
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 6,655 | 7,224
Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 13,601 | 13,804
Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 4,537 | 4,548
Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value | 24,793 | 25,576
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 6,655 | 7,224
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 13,601 | 13,804
Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 4,537 | 4,548
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value | 24,793 | 25,576
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 6,655 | 7,224
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 13,601 | 13,804
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 4,537 | 4,548
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value |  |

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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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