Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities (USD $)	Dec. 31, 2014	Dec. 31, 2013
Securities held to maturity:
Securities held to maturity, amortized cost	$ 199,879,574	$ 145,451,895
Securities held to maturity, gross unrealized gains	2,420,298	299,789
Securities held to maturity, gross unrealized losses	(1,186,076)	(7,111,579)
Securities held to maturity, fair value	201,113,796	138,640,105
Securities available for sale:
Securities available for sale, amortized cost	454,166,979	573,870,562
Securities available for sale, gross unrealized gains	3,360,874	2,643,218
Securities available for sale, gross unrealized losses	(5,868,223)	(24,755,322)
Securities available for sale, fair value	451,659,630us-gaap_AvailableForSaleSecurities	551,758,458us-gaap_AvailableForSaleSecurities
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Securities held to maturity, amortized cost	198,829,574	144,401,895
Securities held to maturity, gross unrealized gains	2,420,298	299,789
Securities held to maturity, gross unrealized losses	(1,186,076)	(7,111,579)
Securities held to maturity, fair value	200,063,796	137,590,105
Securities available for sale:
Securities available for sale, amortized cost	29,408,740	35,813,866
Securities available for sale, gross unrealized gains	1,053,713	923,315
Securities available for sale, gross unrealized losses	(62,472)	(778,324)
Securities available for sale, fair value	30,399,981	35,958,857
Other Securities [Member]
Securities held to maturity:
Securities held to maturity, amortized cost	1,050,000	1,050,000
Securities held to maturity, fair value	1,050,000	1,050,000
Securities available for sale:
Securities available for sale, amortized cost	1,342,554	1,372,365
Securities available for sale, gross unrealized gains	625,145	524,798
Securities available for sale, gross unrealized losses	(846)
Securities available for sale, fair value	1,966,853	1,897,163
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	312,959,760	376,574,132
Securities available for sale, gross unrealized gains	173,685	41,696
Securities available for sale, gross unrealized losses	(5,263,873)	(20,142,841)
Securities available for sale, fair value	307,869,572	356,472,987
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	110,455,925	160,110,199
Securities available for sale, gross unrealized gains	1,508,331	1,153,409
Securities available for sale, gross unrealized losses	(541,032)	(3,834,157)
Securities available for sale, fair value	$ 111,423,224	$ 157,429,451

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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