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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment of Loans Based on Impairment Method (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Individually evaluated for impairment | $ 499 |  | $ 94 |  |  |
Collectively evaluated for impairment | 7,816 |  | 7,405 |  |  |
Total ending allowance balance | 8,315 | $ 7,639 | 7,499 | $ 7,313 | $ 6,952 | $ 7,699
Loans individually evaluated for impairment | 10,942 |  | 18,108 |  |  |
Loans collectively evaluated for impairment | 771,435 |  | 751,211 |  |  |
Total ending loans balance | 782,377 |  | 769,319 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Individually evaluated for impairment | 409 |  |  |  |  |
Collectively evaluated for impairment | 2,023 |  | 1,470 |  |  |
Total ending allowance balance | 2,432 | 1,886 | 1,470 | 1,431 | 1,300 | 939
Loans individually evaluated for impairment | 926 |  | 1,420 |  |  |
Loans collectively evaluated for impairment | 304,388 |  | 307,743 |  |  |
Total ending loans balance | 305,314 |  | 309,163 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Individually evaluated for impairment | 90 |  | 94 |  |  |
Collectively evaluated for impairment | 2,355 |  | 2,884 |  |  |
Total ending allowance balance | 2,445 | 2,392 | 2,978 | 2,960 | 2,813 | 4,315
Loans individually evaluated for impairment | 4,289 |  | 7,333 |  |  |
Loans collectively evaluated for impairment | 214,256 |  | 206,113 |  |  |
Total ending loans balance | 218,545 |  | 213,446 |  |  |
Commercial and Industrial Portfolio Segment [Member] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |
Collectively evaluated for impairment | 1,383 |  | 1,024 |  |  |
Total ending allowance balance | 1,383 | 1,242 | 1,024 | 972 | 932 | 907
Loans individually evaluated for impairment | 5,727 |  | 9,154 |  |  |
Loans collectively evaluated for impairment | 110,762 |  | 97,935 |  |  |
Total ending loans balance | 116,489 |  | 107,089 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |
Collectively evaluated for impairment | 2,055 |  | 2,027 |  |  |
Total ending allowance balance | 2,055 | $ 2,119 | 2,027 | $ 1,950 | $ 1,907 | $ 1,538
Loans individually evaluated for impairment |  |  | 201 |  |  |
Loans collectively evaluated for impairment | 142,029 |  | 139,420 |  |  |
Total ending loans balance | $ 142,029 |  | $ 139,621 |  |  |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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