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Note 4 - Loans (Details) - Loan Portfolio by Credit Quality Indicator - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consumer and Other
Loans receivable	$ 758,635,595	$ 746,093,809	$ 751,218,462
Pass [Member]
Consumer and Other
Loans receivable	700,095,542	686,071,625
Special Mention [Member]
Consumer and Other
Loans receivable	26,142,883	27,139,338
Substandard [Member]
Consumer and Other
Loans receivable	32,397,170	32,882,846
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Consumer and Other
Loans receivable	47,781,689	50,960,265	48,107,448
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Pass [Member]
Consumer and Other
Loans receivable	44,273,407	46,230,110
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	1,927,198	2,905,361
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]
Consumer and Other
Loans receivable	1,581,084	1,824,794
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Consumer and Other
Loans receivable	19,193,497	16,689,444	10,665,938
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Pass [Member]
Consumer and Other
Loans receivable	18,970,328	16,504,404
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	17,843	27,101
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Substandard [Member]
Consumer and Other
Loans receivable	205,326	157,939
Real Estate Portfolio Segment [Member] | Commercial [Member]
Consumer and Other
Loans receivable	346,262,033	332,230,847	341,783,538
Real Estate Portfolio Segment [Member] | Commercial [Member] | Pass [Member]
Consumer and Other
Loans receivable	320,566,237	309,828,039
Real Estate Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	13,652,416	11,220,166
Real Estate Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]
Consumer and Other
Loans receivable	12,043,380	11,182,642
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Consumer and Other
Loans receivable	40,106,633	51,258,970	52,738,783
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Pass [Member]
Consumer and Other
Loans receivable	36,516,165	45,063,306
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	912,295	1,740,488
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Substandard [Member]
Consumer and Other
Loans receivable	2,678,173	4,455,176
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Consumer and Other
Loans receivable	9,413,263	11,220,683	6,549,260
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Pass [Member]
Consumer and Other
Loans receivable	9,413,263	11,220,683
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	0	0
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Substandard [Member]
Consumer and Other
Loans receivable	0	0
Real Estate Portfolio Segment [Member] | Residential [Member]
Consumer and Other
Loans receivable	197,002,419	203,752,620	206,257,927
Real Estate Portfolio Segment [Member] | Residential [Member] | Pass [Member]
Consumer and Other
Loans receivable	177,054,188	180,549,640
Real Estate Portfolio Segment [Member] | Residential [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	8,545,942	10,582,704
Real Estate Portfolio Segment [Member] | Residential [Member] | Substandard [Member]
Consumer and Other
Loans receivable	11,402,289	12,620,276
Real Estate Portfolio Segment [Member] | Farmland [Member]
Consumer and Other
Loans receivable	61,779,859	49,950,984	47,034,426
Real Estate Portfolio Segment [Member] | Farmland [Member] | Pass [Member]
Consumer and Other
Loans receivable	56,798,365	47,548,106
Real Estate Portfolio Segment [Member] | Farmland [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	929,814	414,521
Real Estate Portfolio Segment [Member] | Farmland [Member] | Substandard [Member]
Consumer and Other
Loans receivable	4,051,680	1,988,357
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Consumer and Other
Loans receivable	20,605,465	22,820,314	25,675,560
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Pass [Member]
Consumer and Other
Loans receivable	20,037,996	22,114,932
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	156,739	248,997
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Substandard [Member]
Consumer and Other
Loans receivable	410,730	456,385
Consumer and Other Portfolio Segment [Member] | Other [Member]
Consumer and Other
Loans receivable	16,490,737	7,209,682	$ 12,405,582
Consumer and Other Portfolio Segment [Member] | Other [Member] | Pass [Member]
Consumer and Other
Loans receivable	16,465,593	7,012,405
Consumer and Other Portfolio Segment [Member] | Other [Member] | Special Mention [Member]
Consumer and Other
Loans receivable	636	0
Consumer and Other Portfolio Segment [Member] | Other [Member] | Substandard [Member]
Consumer and Other
Loans receivable	$ 24,508	$ 197,277

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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