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Note 15 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available-for-sale, at fair value | $ 141,421 | $ 153,871
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] |  |
Other assets - derivatives, fair value | 977 | 443
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |
Other assets - derivatives, fair value |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |
Other assets - derivatives, fair value | 977 | 443
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] |  |
Other assets - derivatives, fair value |  |
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale, at fair value | 78,688 | 82,786
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 78,688 | 82,786
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 78,688 | 82,786
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, 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 | 61,619 | 66,074
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 61,619 | 66,074
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 61,619 | 66,074
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, 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 | 1,034 | 4,931
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 1,034 | 4,931
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, 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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 1,034 | 4,931
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, 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 | 80 | 80
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Investment securities available-for-sale, at fair value | 80 | 80
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available-for-sale, at fair value |  |
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available-for-sale, at fair value | 80 | 80
US Treasury Securities [Member] | Fair Value, Measurements, 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 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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