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Note 16 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available-for-sale, at fair value | $ 127,185 | $ 132,487
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale, at fair value | 69,905 | 72,455
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 70,759 | 72,455
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 70,759 | 72,455
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available-for-sale, at fair value |  |
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale, at fair value | 51,521 | 54,289
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 52,786 | 54,289
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 52,786 | 54,289
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available-for-sale, at fair value |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale, at fair value | 5,681 | 5,664
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 5,608 | 5,664
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 5,608 | 5,664
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available-for-sale, at fair value |  |
US Treasury Securities [Member] |  |
Investment securities available-for-sale, at fair value | 78 | 79
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 79 | 79
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 79 | 79
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available-for-sale, 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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: 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=118954083&loc=d3e26610-111562 Reference 3: 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=118939692&loc=d3e27161-111563 + Details
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