Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $)	Mar. 31, 2015	Dec. 31, 2014
Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities available for sale, less than 12 months, fair value	$ 130,080,057	$ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses	(564,834)	(115,453)
Securities available for sale, 12 months or more, fair value	117,710,039	297,739,167
Securities available for sale, 12 months or more, gross unrealized losses	(1,336,850)	(5,752,770)
Securities available for sale, fair value	247,790,096	333,583,862
Securities available for sale, gross unrealized losses	(1,901,684)	(5,868,223)
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities held to maturity, less than 12 months, fair value	48,692,267	20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses	(991,314)	(587,992)
Securities held to maturity, 12 months or more, fair value	30,617,292	38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses	(821,429)	(598,084)
Securities held to maturity, fair value	79,309,559	59,198,597
Securities held to maturity, gross unrealized losses	(1,812,743)	(1,186,076)
Securities available for sale, less than 12 months, fair value	598,285	920,935
Securities available for sale, less than 12 months, gross unrealized losses	(2,790)	(1,773)
Securities available for sale, 12 months or more, fair value	1,339,977	4,425,337
Securities available for sale, 12 months or more, gross unrealized losses	(40,933)	(60,699)
Securities available for sale, fair value	1,938,262	5,346,272
Securities available for sale, gross unrealized losses	(43,723)	(62,472)
US Government Agencies Debt Securities [Member]
Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities available for sale, less than 12 months, fair value	102,286,952	23,970,085
Securities available for sale, less than 12 months, gross unrealized losses	(435,457)	(102,695)
Securities available for sale, 12 months or more, fair value	93,948,175	255,743,056
Securities available for sale, 12 months or more, gross unrealized losses	(960,110)	(5,161,178)
Securities available for sale, fair value	196,235,127	279,713,141
Securities available for sale, gross unrealized losses	(1,395,567)	(5,263,873)
Residential Mortgage Backed Securities [Member]
Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities available for sale, less than 12 months, fair value	27,194,344	10,710,671
Securities available for sale, less than 12 months, gross unrealized losses	(126,489)	(10,139)
Securities available for sale, 12 months or more, fair value	22,421,887	37,570,774
Securities available for sale, 12 months or more, gross unrealized losses	(335,807)	(530,893)
Securities available for sale, fair value	49,616,231	48,281,445
Securities available for sale, gross unrealized losses	(462,296)	(541,032)
Other Securities [Member]
Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
Securities available for sale, less than 12 months, fair value	476	243,004
Securities available for sale, less than 12 months, gross unrealized losses	(98)	(846)
Securities available for sale, fair value	476	243,004
Securities available for sale, gross unrealized losses	$ (98)	$ (846)

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