Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $)	Dec. 31, 2014	Dec. 31, 2013
Securities available for sale:
Securities available for sale, less than 12 months, fair value	$ 35,844,695	$ 441,808,604
Securities available for sale, less than 12 months, gross unrealized losses	(115,453)	(22,813,786)
Securities available for sale, 12 months or more, fair value	297,739,167	26,081,796
Securities available for sale, 12 months or more, gross unrealized losses	(5,752,770)	(1,941,536)
Securities available for sale, fair value	333,583,862	467,890,400
Securities available for sale, gross unrealized losses	(5,868,223)	(24,755,322)
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Securities held to maturity, less than 12 months, fair value	20,419,052	101,983,602
Securities held to maturity, less than 12 months, gross unrealized losses	(587,992)	(6,711,240)
Securities held to maturity, 12 months or more, fair value	38,779,545	2,697,375
Securities held to maturity, 12 months or more, gross unrealized losses	(598,084)	(400,339)
Securities held to maturity, fair value	59,198,597	104,680,977
Securities held to maturity, gross unrealized losses	(1,186,076)	(7,111,579)
Securities available for sale:
Securities available for sale, less than 12 months, fair value	920,935	13,890,692
Securities available for sale, less than 12 months, gross unrealized losses	(1,773)	(724,939)
Securities available for sale, 12 months or more, fair value	4,425,337	985,687
Securities available for sale, 12 months or more, gross unrealized losses	(60,699)	(53,385)
Securities available for sale, fair value	5,346,272	14,876,379
Securities available for sale, gross unrealized losses	(62,472)	(778,324)
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale, less than 12 months, fair value	23,970,085	333,194,820
Securities available for sale, less than 12 months, gross unrealized losses	(102,695)	(19,141,077)
Securities available for sale, 12 months or more, fair value	255,743,056	10,978,390
Securities available for sale, 12 months or more, gross unrealized losses	(5,161,178)	(1,001,764)
Securities available for sale, fair value	279,713,141	344,173,210
Securities available for sale, gross unrealized losses	(5,263,873)	(20,142,841)
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale, less than 12 months, fair value	10,710,671	94,723,092
Securities available for sale, less than 12 months, gross unrealized losses	(10,139)	(2,947,770)
Securities available for sale, 12 months or more, fair value	37,570,774	14,117,719
Securities available for sale, 12 months or more, gross unrealized losses	(530,893)	(886,387)
Securities available for sale, fair value	48,281,445	108,840,811
Securities available for sale, gross unrealized losses	(541,032)	(3,834,157)
Other Securities [Member]
Securities available for sale:
Securities available for sale, less than 12 months, fair value	243,004
Securities available for sale, less than 12 months, gross unrealized losses	(846)
Securities available for sale, fair value	243,004
Securities available for sale, gross unrealized losses	$ (846)

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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 twelve months or longer.

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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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