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Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | $ 2,073,418 | $ 1,051,114 | $ 2,299,450 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 6,530,487 | 7,751,202 | 9,506,536 |
Ending Allowance Balance, Total | 8,603,905 | 8,802,316 | 11,805,986 | $ 12,736,921
Ending Loan Balance, Individually Evaluated for Impairment | 30,382,471 | 34,434,776 | 42,443,140 |
Ending Loan Balance, Collectively Evaluated for Impairment | 728,253,124 | 711,659,033 | 708,775,322 |
Ending Loan Balance, Total | 758,635,595 | 746,093,809 | 751,218,462 |
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 94,538 | 96,580 | 433,714 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 760,826 | 400,981 | 583,359 |
Ending Allowance Balance, Total | 855,364 | 497,561 | 1,017,073 | 981,021
Ending Loan Balance, Individually Evaluated for Impairment | 122,928 | 96,580 | 1,542,058 |
Ending Loan Balance, Collectively Evaluated for Impairment | 47,658,761 | 50,863,685 | 46,565,390 |
Ending Loan Balance, Total | 47,781,689 | 50,960,265 | 48,107,448 |
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 203,091 | 304,172 | 293,886 |
Ending Allowance Balance, Total | 203,091 | 304,172 | 293,886 | 296,175
Ending Loan Balance, Individually Evaluated for Impairment | 8,445 | 0 | 0 |
Ending Loan Balance, Collectively Evaluated for Impairment | 19,185,052 | 16,689,444 | 10,665,938 |
Ending Loan Balance, Total | 19,193,497 | 16,689,444 | 10,665,938 |
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 1,607,962 | 456,941 | 423,685 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 2,242,565 | 3,207,836 | 3,955,591 |
Ending Allowance Balance, Total | 3,850,527 | 3,664,777 | 4,379,276 | 5,162,839
Ending Loan Balance, Individually Evaluated for Impairment | 23,628,213 | 21,693,061 | 24,757,942 |
Ending Loan Balance, Collectively Evaluated for Impairment | 322,633,820 | 310,537,786 | 317,025,596 |
Ending Loan Balance, Total | 346,262,033 | 332,230,847 | 341,783,538 |
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 25,344 | 53,947 | 830,546 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 665,422 | 1,168,748 | 951,633 |
Ending Allowance Balance, Total | 690,766 | 1,222,695 | 1,782,179 | 1,890,200
Ending Loan Balance, Individually Evaluated for Impairment | 1,622,560 | 3,384,377 | 7,971,298 |
Ending Loan Balance, Collectively Evaluated for Impairment | 38,484,073 | 47,874,593 | 44,767,485 |
Ending Loan Balance, Total | 40,106,633 | 51,258,970 | 52,738,783 |
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 19,890 | 138,092 | 138,092 |
Ending Allowance Balance, Total | 19,890 | 138,092 | 138,092 | 138,092
Ending Loan Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Loan Balance, Collectively Evaluated for Impairment | 9,413,263 | 11,220,683 | 6,549,260 |
Ending Loan Balance, Total | 9,413,263 | 11,220,683 | 6,549,260 |
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 308,188 | 414,684 | 526,005 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 1,682,167 | 2,010,643 | 2,752,264 |
Ending Allowance Balance, Total | 1,990,355 | 2,425,327 | 3,278,269 | 3,405,947
Ending Loan Balance, Individually Evaluated for Impairment | 3,597,386 | 7,559,965 | 6,545,490 |
Ending Loan Balance, Collectively Evaluated for Impairment | 193,405,033 | 196,192,655 | 199,712,437 |
Ending Loan Balance, Total | 197,002,419 | 203,752,620 | 206,257,927 |
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 37,386 | 28,962 | 85,500 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 874,306 | 74,838 | 225,994 |
Ending Allowance Balance, Total | 911,692 | 103,800 | 311,494 | 290,526
Ending Loan Balance, Individually Evaluated for Impairment | 1,402,939 | 1,700,793 | 1,617,206 |
Ending Loan Balance, Collectively Evaluated for Impairment | 60,376,920 | 48,250,191 | 45,417,220 |
Ending Loan Balance, Total | 61,779,859 | 49,950,984 | 47,034,426 |
Consumer and Other Portfolio Segment [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Total |  | 378,978 | 362,464 |
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 63,377 | 66,914 | 243,253 |
Ending Allowance Balance, Total | 63,377 | 66,914 | 243,253 | 227,774
Ending Loan Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Loan Balance, Collectively Evaluated for Impairment | 20,605,465 | 22,820,314 | 25,675,560 |
Ending Loan Balance, Total | 20,605,465 | 22,820,314 | 25,675,560 |
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |  |
Note 5 - Allowance for Loan Losses (Details) - Allowance for Loan Losses, Segregated by Impairment Methodology [Line Items] |  |  |  |
Ending Allowance Balance, Individually Evaluated for Impairment | 0 | 0 | 0 |
Ending Allowance Balance, Collectively Evaluated for Impairment | 18,843 | 378,978 | 362,464 |
Ending Allowance Balance, Total | 18,843 | 378,978 | 362,464 | $ 344,347
Ending Loan Balance, Individually Evaluated for Impairment | 0 | 0 | 9,146 |
Ending Loan Balance, Collectively Evaluated for Impairment | 16,490,737 | 7,209,682 | 12,396,436 |
Ending Loan Balance, Total | $ 16,490,737 | $ 7,209,682 | $ 12,405,582 |

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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://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=49124121&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=49124121&loc=SL6953423-111524 + Details
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