Note 2 - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity, less than 12 months, fair value	$ 5,805,354	$ 14,803,408
Securities held to maturity, less than 12 months, gross unrealized losses	(384,457)	(294,438)
Securities held to maturity, 12 months or more, fair value	14,508,402	19,927,581
Securities held to maturity, 12 months or more, gross unrealized losses	(346,713)	(878,994)
Securities held to maturity, fair value	20,313,756	34,730,989
Securities held to maturity, gross unrealized losses	(731,170)	(1,173,432)
Securities available for sale, less than 12 months, fair value	380,749	2,220,800
Securities available for sale, less than 12 months, gross unrealized losses	(206)	(31,807)
Securities available for sale, 12 months or more, fair value	850,050	848,329
Securities available for sale, 12 months or more, gross unrealized losses	(16,159)	(27,571)
Securities available for sale, fair value	1,230,799	3,069,129
Securities available for sale, gross unrealized losses	(16,365)	(59,378)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	5,825,476	112,900,327
Securities available for sale, less than 12 months, gross unrealized losses	(80,276)	(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	5,825,476	177,376,988
Securities available for sale, gross unrealized losses	(80,276)	(2,848,561)
Residential Mortgage Backed Securities [Member]
Securities available for sale, less than 12 months, fair value	4,337,187	40,356,921
Securities available for sale, less than 12 months, gross unrealized losses	(7,492)	(730,466)
Securities available for sale, 12 months or more, fair value	8,829,330	19,836,637
Securities available for sale, 12 months or more, gross unrealized losses	(72,784)	(552,973)
Securities available for sale, fair value	13,166,517	60,193,558
Securities available for sale, gross unrealized losses	(80,276)	(1,283,439)
Other Securities [Member]
Securities available for sale, less than 12 months, fair value		411
Securities available for sale, less than 12 months, gross unrealized losses		(163)
Securities available for sale, fair value		411
Securities available for sale, gross unrealized losses		(163)
Securities available for sale, less than 12 months, fair value	10,543,412	155,478,459
Securities available for sale, less than 12 months, gross unrealized losses	(87,974)	(2,160,027)
Securities available for sale, 12 months or more, fair value	9,679,380	85,161,627
Securities available for sale, 12 months or more, gross unrealized losses	(88,943)	(2,031,514)
Securities available for sale, fair value	20,222,792	240,640,086
Securities available for sale, gross unrealized losses	$ (176,917)	$ (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
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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 less than twelve months.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

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This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

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