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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information for Financial Instruments Measured at Fair Value (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | ---
Other Real Estate Owned, fair value | $ 2,173 | $ 4,256 | $ 6,439
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | 5,185 | 4,876 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | 5,185 | 4,876 |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Other Real Estate Owned, fair value | $ 1,468 | $ 2,015 |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Other Real Estate Owned, measurement input | (0.476) | (0.2274) |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Other Real Estate Owned, measurement input | 0.0982 | 0.0544 |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Other Real Estate Owned, measurement input | 0.2502 | 0.15 |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Other Real Estate Owned, measurement input | 0.8121 | 0.8724 |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Other Real Estate Owned, measurement input | (0.1129) | (0.0387) |
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member] |  |  |
Other Real Estate Owned, measurement input | 0.3448 | 0.2444 |
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Cap Rate [Member] |  |  |
Other Real Estate Owned, measurement input |  | 0.1 |
Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Discount Rate [Member] |  |  |
Other Real Estate Owned, measurement input | 0.1 |  |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | $ 427 | $ 427 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | (0.16) | (0.16) |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0 | 0 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 19.75 | 19.75 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.1 | 0.1 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 9.795 | 9.795 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.05 | 0.05 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | $ 15 | $ 82 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | (0.433) | (0.433) |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.1 | 0 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 0.667 | 0.833 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.25 | 0.25 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 0.117 | 0.2 |
Real Estate Portfolio Segment [Member] | Residential [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.175 | 0.125 |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0 |  |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Cost to Sell [Member] |  |  |
Impaired loans, measurement input | 0 |  |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 10 |  |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Cost to Sell [Member] |  |  |
Impaired loans, measurement input | 0 |  |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 0.0474 |  |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | $ 4,406 | $ 4,017 |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input |  | 0 |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input |  | 0.1 |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input |  | 0.05 |
Real Estate Portfolio Segment [Member] | Commercial [Member] | Valuation, Income Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Cap Rate [Member] |  |  |
Impaired loans, measurement input | 0.1075 | 0.1075 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Impaired loans, fair value | $ 337 | $ 350 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | (0.71) | (0.71) |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.1 | 0.1 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input | 0.887 | 0.887 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 80 | 0.75 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member] |  |  |
Impaired loans, measurement input |  | 0.0885 |
Real Estate Portfolio Segment [Member] | Farmland [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member] |  |  |
Impaired loans, measurement input | 0.0885 | 0.425 |
Other Real Estate Owned, measurement input | 0.45 |  |

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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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