Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity, less than 12 months, fair value	$ 23,632,888	$ 14,803,408
Securities held to maturity, less than 12 months, gross unrealized losses	(251,558)	(294,438)
Securities held to maturity, 12 months or more, fair value	14,150,396	19,927,581
Securities held to maturity, 12 months or more, gross unrealized losses	(527,424)	(878,994)
Securities held to maturity, fair value	37,783,284	34,730,989
Securities held to maturity, gross unrealized losses	(778,982)	(1,173,432)
Securities available for sale, less than 12 months, fair value	25,921,780	2,220,800
Securities available for sale, less than 12 months, gross unrealized losses	(49,087)	(31,807)
Securities available for sale, 12 months or more, fair value	846,894	848,329
Securities available for sale, 12 months or more, gross unrealized losses	(14,412)	(27,571)
Securities available for sale, fair value	26,768,674	3,069,129
Securities available for sale, gross unrealized losses	(63,499)	(59,378)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	9,547,746	112,900,327
Securities available for sale, less than 12 months, gross unrealized losses	(73,463)	(1,397,591)
Securities available for sale, 12 months or more, fair value		64,476,661
Securities available for sale, 12 months or more, gross unrealized losses		(1,450,970)
Securities available for sale, fair value	9,547,746	177,376,988
Securities available for sale, gross unrealized losses	(73,463)	(2,848,561)
Residential Mortgage Backed Securities [Member]
Securities available for sale, less than 12 months, fair value	9,326,000	40,356,921
Securities available for sale, less than 12 months, gross unrealized losses	(78,305)	(730,466)
Securities available for sale, 12 months or more, fair value	8,464,738	19,836,637
Securities available for sale, 12 months or more, gross unrealized losses	(69,247)	(552,973)
Securities available for sale, fair value	17,790,738	60,193,558
Securities available for sale, gross unrealized losses	(147,552)	(1,283,439)
Other Securities [Member]
Securities available for sale, less than 12 months, fair value	641,430	411
Securities available for sale, less than 12 months, gross unrealized losses	(3,227)	(163)
Securities available for sale, fair value	641,430	411
Securities available for sale, gross unrealized losses	(3,227)	(163)
Securities available for sale, less than 12 months, fair value	45,436,956	155,478,459
Securities available for sale, less than 12 months, gross unrealized losses	(204,082)	(2,160,027)
Securities available for sale, 12 months or more, fair value	9,311,632	85,161,627
Securities available for sale, 12 months or more, gross unrealized losses	(83,659)	(2,031,514)
Securities available for sale, fair value	54,748,588	240,640,086
Securities available for sale, gross unrealized losses	$ (287,741)	$ (4,191,541)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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