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Note 4 - Allowance for Loan Losses - Segregated by Impairment Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Commercial [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment |  |  | $ 91 |
Ending allowance balance, collectively evaluated for impairment | 491 |  | 211 |
Allowance for loan losses, ending balance | 491 | $ 855 | 302 | $ 497
Ending loan balance, individually evaluated for impairment | 8 |  | 91 |
Ending loan balance, collectively evaluated for impairment | 45,765 |  | 48,668 |
Loans | 45,773 | 47,782 | 48,759 |
Commercial [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 2,470 |  | 243 |
Ending allowance balance, collectively evaluated for impairment | 2,817 |  | 3,581 |
Allowance for loan losses, ending balance | 5,287 | 3,851 | 3,824 | 3,665
Ending loan balance, individually evaluated for impairment | 24,363 |  | 20,049 |
Ending loan balance, collectively evaluated for impairment | 325,029 |  | 327,654 |
Loans | 349,392 | 346,262 | 347,703 |
Agricultural [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment |  |  |  |
Ending allowance balance, collectively evaluated for impairment | 281 |  | 306 |
Allowance for loan losses, ending balance | 281 | 203 | 306 | 304
Ending loan balance, individually evaluated for impairment |  |  | 8 |
Ending loan balance, collectively evaluated for impairment | 26,547 |  | 27,365 |
Loans | 26,547 | 19,193 | 27,373 |
Commercial Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 22 |  | 14 |
Ending allowance balance, collectively evaluated for impairment | 436 |  | 1,677 |
Allowance for loan losses, ending balance | 458 | 691 | 1,691 | 1,223
Ending loan balance, individually evaluated for impairment | 380 |  | 2,694 |
Ending loan balance, collectively evaluated for impairment | 33,344 |  | 40,895 |
Loans | 33,724 | 40,107 | 43,589 |
Residential Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment |  |  |  |
Ending allowance balance, collectively evaluated for impairment | 22 |  | 138 |
Allowance for loan losses, ending balance | 22 | 20 | 138 | 138
Ending loan balance, individually evaluated for impairment |  |  |  |
Ending loan balance, collectively evaluated for impairment | 10,325 |  | 10,465 |
Loans | 10,325 | 9,413 | 10,465 |
Residential [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 435 |  | 308 |
Ending allowance balance, collectively evaluated for impairment | 1,230 |  | 1,387 |
Allowance for loan losses, ending balance | 1,665 | 1,990 | 1,695 | 2,425
Ending loan balance, individually evaluated for impairment | 3,200 |  | 3,380 |
Ending loan balance, collectively evaluated for impairment | 191,845 |  | 192,420 |
Loans | 195,045 | 197,002 | 195,800 |
Farmland [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment | 33 |  | 57 |
Ending allowance balance, collectively evaluated for impairment | 829 |  | 20 |
Allowance for loan losses, ending balance | 862 | 912 | 77 | 104
Ending loan balance, individually evaluated for impairment | 1,047 |  | 1,695 |
Ending loan balance, collectively evaluated for impairment | 72,754 |  | 59,856 |
Loans | 73,801 | 61,780 | 61,551 |
Consumer [Member] | Consumer and Other Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment |  |  |  |
Ending allowance balance, collectively evaluated for impairment | 103 |  |  |
Allowance for loan losses, ending balance | 103 | 63 |  | 67
Ending loan balance, individually evaluated for impairment |  |  |  |
Ending loan balance, collectively evaluated for impairment | 20,378 |  | 20,958 |
Loans | 20,378 | 20,605 | 20,958 |
Other [Member] | Consumer and Other Portfolio Segment [Member] |  |  |  |
Ending allowance balance, individually evaluated for impairment |  |  |  |
Ending allowance balance, collectively evaluated for impairment | 34 |  | 369 |
Allowance for loan losses, ending balance | 34 | 19 | 369 | 379
Ending loan balance, individually evaluated for impairment |  |  |  |
Ending loan balance, collectively evaluated for impairment | 21,132 |  | 8,006 |
Loans | 21,132 | 16,492 | 8,006 |
Ending allowance balance, individually evaluated for impairment | 2,960 |  | 713 |
Ending allowance balance, collectively evaluated for impairment | 6,243 |  | 7,689 |
Allowance for loan losses, ending balance | 9,203 | 8,604 | 8,402 | $ 8,802
Ending loan balance, individually evaluated for impairment | 28,998 |  | 27,917 |
Ending loan balance, collectively evaluated for impairment | 747,119 |  | 736,287 |
Loans | $ 776,117 | $ 758,636 | $ 764,204 |

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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=6379141&loc=d3e15032-111544 + Details
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