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Note 4 - Allowance for Loan Losses - Segregated by Impairment Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Ending allowance balance, individually evaluated for impairment | $ 1,487 |  | $ 1,585 |
Ending allowance balance, collectively evaluated for impairment | 5,668 |  | 6,392 |
Ending allowance balance | 7,155 | $ 7,508 | 7,977 | $ 8,923
Ending loan balance, individually evaluated for impairment | 19,557 |  | 21,426 |
Ending loan balance, collectively evaluated for impairment | 759,886 |  | 748,620 |
Loans | 779,443 | 765,284 | 770,046 |
Ending loan balance | 779,443 | 765,284 | 770,046 |
Commercial [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 0 |  | 0 |
Ending allowance balance, collectively evaluated for impairment | 384 |  | 436 |
Ending allowance balance | 384 | 447 | 436 | 456
Ending loan balance, individually evaluated for impairment | 39 |  | 77 |
Ending loan balance, collectively evaluated for impairment | 47,253 |  | 45,286 |
Loans | 47,292 | 48,122 | 45,363 |
Ending loan balance | 47,292 | 48,122 | 45,363 |
Commercial [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 1,394 |  | 1,471 |
Ending allowance balance, collectively evaluated for impairment | 2,887 |  | 2,752 |
Ending allowance balance | 4,281 | 3,874 | 4,223 | 5,751
Ending loan balance, individually evaluated for impairment | 15,164 |  | 17,605 |
Ending loan balance, collectively evaluated for impairment | 334,244 |  | 328,646 |
Loans | 349,408 | 351,172 | 346,251 |
Ending loan balance | 349,408 | 351,172 | 346,251 |
Agricultural [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 0 |  | 0 |
Ending allowance balance, collectively evaluated for impairment | 315 |  | 249 |
Ending allowance balance | 315 | 186 | 249 | 168
Ending loan balance, individually evaluated for impairment | 27 |  | 5 |
Ending loan balance, collectively evaluated for impairment | 21,388 |  | 25,241 |
Loans | 21,415 | 16,443 | 25,246 |
Ending loan balance | 21,415 | 16,443 | 25,246 |
Commercial Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 44 |  | 69 |
Ending allowance balance, collectively evaluated for impairment | 81 |  | 919 |
Ending allowance balance | 125 | 1,216 | 988 | 323
Ending loan balance, individually evaluated for impairment | 471 |  | 497 |
Ending loan balance, collectively evaluated for impairment | 53,099 |  | 36,036 |
Loans | 53,570 | 45,214 | 36,533 |
Ending loan balance | 53,570 | 45,214 | 36,533 |
Residential Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 0 |  | 0 |
Ending allowance balance, collectively evaluated for impairment | 17 |  | 6 |
Ending allowance balance | 17 |  | 6 | 13
Ending loan balance, individually evaluated for impairment | 0 |  | 0 |
Ending loan balance, collectively evaluated for impairment | 12,897 |  | 8,905 |
Loans | 12,897 | 8,583 | 8,905 |
Ending loan balance | 12,897 | 8,583 | 8,905 |
Residential [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 20 |  | 21 |
Ending allowance balance, collectively evaluated for impairment | 1,162 |  | 1,108 |
Ending allowance balance | 1,182 | 968 | 1,129 | 1,396
Ending loan balance, individually evaluated for impairment | 1,753 |  | 2,204 |
Ending loan balance, collectively evaluated for impairment | 187,400 |  | 194,128 |
Loans | 189,153 | 194,049 | 196,332 |
Ending loan balance | 189,153 | 194,049 | 196,332 |
Farmland [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 29 |  | 24 |
Ending allowance balance, collectively evaluated for impairment | 701 |  | 848 |
Ending allowance balance | 730 | 780 | 872 | 722
Ending loan balance, individually evaluated for impairment | 2,103 |  | 1,038 |
Ending loan balance, collectively evaluated for impairment | 67,966 |  | 70,865 |
Loans | 70,069 | 67,768 | 71,903 |
Ending loan balance | 70,069 | 67,768 | 71,903 |
Consumer [Member] | Consumer and Other Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 0 |  | 0 |
Ending allowance balance, collectively evaluated for impairment | 93 |  | 56 |
Ending allowance balance | 93 | 34 | 56 | 80
Ending loan balance, individually evaluated for impairment | 0 |  | 0 |
Ending loan balance, collectively evaluated for impairment | 18,623 |  | 18,677 |
Loans | 18,623 | 18,956 | 18,677 |
Ending loan balance | 18,623 | 18,956 | 18,677 |
Other [Member] | Consumer and Other Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 0 |  | 0 |
Ending allowance balance, collectively evaluated for impairment | 28 |  | 18 |
Ending allowance balance | 28 | 3 | 18 | $ 14
Ending loan balance, individually evaluated for impairment | 0 |  | 0 |
Ending loan balance, collectively evaluated for impairment | 17,016 |  | 20,836 |
Loans | 17,016 | 14,977 | 20,836 |
Ending loan balance | $ 17,016 | $ 14,977 | $ 20,836 |

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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 of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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