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Note 5 - Allowance for Loan Losses - Segregated by Class of Loan (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for loan losses, beginning balance | $ 8,923,293 | $ 8,603,905 | $ 8,802,316
Allowance for loan losses, charge-offs | (2,915,753) | (2,087,850) | (2,083,347)
Allowance for loan losses, recoveries | 1,109,968 | 1,345,238 | 1,019,436
Provision for Loan Losses | 390,000 | 1,062,000 | 865,500
Allowance for loan losses, ending balance | 7,507,508 | 8,923,293 | 8,603,905
Allowance for loan losses, provision | 390,000 | 1,062,000 | 865,500
Commercial [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 456,197 | 855,364 | 497,561
Allowance for loan losses, charge-offs | (299,079) | (304,918) | (454,971)
Allowance for loan losses, recoveries | 136,499 | 66,738 | 52,111
Provision for Loan Losses | 153,058 | (160,987) | 760,663
Allowance for loan losses, ending balance | 446,675 | 456,197 | 855,364
Allowance for loan losses, provision | 153,058 | (160,987) | 760,663
Commercial [Member] | Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 5,750,998 | 3,850,527 | 3,664,777
Allowance for loan losses, charge-offs | (966,014) | (992,067) | (275,297)
Allowance for loan losses, recoveries | 527,150 | 206,154 | 270,003
Provision for Loan Losses | (1,438,175) | 2,686,384 | 191,044
Allowance for loan losses, ending balance | 3,873,959 | 5,750,998 | 3,850,527
Allowance for loan losses, provision | (1,438,175) | 2,686,384 | 191,044
Agricultural [Member] | Commercial and Agricultural Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 167,692 | 203,091 | 304,172
Allowance for loan losses, charge-offs | (159,500) | (19,258) | (5,000)
Allowance for loan losses, recoveries | 3,963 | 4,150 | 3,600
Provision for Loan Losses | 173,749 | (20,291) | (99,681)
Allowance for loan losses, ending balance | 185,904 | 167,692 | 203,091
Allowance for loan losses, provision | 173,749 | (20,291) | (99,681)
Commercial Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 322,725 | 690,766 | 1,222,695
Allowance for loan losses, charge-offs | (51,977) | (25,318) | (97,698)
Allowance for loan losses, recoveries | 266,459 | 814,586 | 485,834
Provision for Loan Losses | 678,808 | (1,157,309) | (920,065)
Allowance for loan losses, ending balance | 1,216,015 | 322,725 | 690,766
Allowance for loan losses, provision | 678,808 | (1,157,309) | (920,065)
Residential Construction [Member] | Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 13,491 | 19,890 | 138,092
Allowance for loan losses, charge-offs |  |  |
Allowance for loan losses, recoveries |  |  |
Provision for Loan Losses | (13,491) | (6,399) | (118,202)
Allowance for loan losses, ending balance |  | 13,491 | 19,890
Allowance for loan losses, provision | (13,491) | (6,399) | (118,202)
Residential [Member] | Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 1,396,099 | 1,990,355 | 2,425,327
Allowance for loan losses, charge-offs | (1,048,337) | (361,630) | (929,668)
Allowance for loan losses, recoveries | 82,079 | 49,660 | 109,626
Provision for Loan Losses | 538,260 | (282,286) | 385,070
Allowance for loan losses, ending balance | 968,101 | 1,396,099 | 1,990,355
Allowance for loan losses, provision | 538,260 | (282,286) | 385,070
Farmland [Member] | Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 722,331 | 911,692 | 103,800
Allowance for loan losses, charge-offs | (60,902) | (119,576) | (40,000)
Allowance for loan losses, recoveries | 16,750 | 145,000 | 20,000
Provision for Loan Losses | 101,352 | (214,785) | 827,892
Allowance for loan losses, ending balance | 779,531 | 722,331 | 911,692
Allowance for loan losses, provision | 101,352 | (214,785) | 827,892
Consumer [Member] | Consumer and Other Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 80,265 | 63,377 | 66,914
Allowance for loan losses, charge-offs | (329,944) | (265,083) | (255,062)
Allowance for loan losses, recoveries | 74,933 | 52,629 | 61,976
Provision for Loan Losses | 208,739 | 229,342 | 189,549
Allowance for loan losses, ending balance | 33,993 | 80,265 | 63,377
Allowance for loan losses, provision | 208,739 | 229,342 | 189,549
Other [Member] | Consumer and Other Portfolio Segment [Member] |  |  |
Allowance for loan losses, beginning balance | 13,495 | 18,843 | 378,978
Allowance for loan losses, charge-offs |  |  | (25,651)
Allowance for loan losses, recoveries | 2,135 | 6,321 | 16,286
Provision for Loan Losses | (12,300) | (11,669) | (350,770)
Allowance for loan losses, ending balance | 3,330 | 13,495 | 18,843
Allowance for loan losses, provision | $ (12,300) | $ (11,669) | $ (350,770)

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: 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 + 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=84173941&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=84173941&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=82894903&loc=d3e15032-111544 + Details
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