Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities (USD $)	Mar. 31, 2015	Dec. 31, 2014
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities [Line Items]
Securities held to maturity, amortized cost	$ 215,146,171	$ 199,879,574
Securities held to maturity, gross unrealized gains	2,303,569	2,420,298
Securities held to maturity, gross unrealized losses	(1,812,743)	(1,186,076)
Securities held to maturity, fair value	215,636,997	201,113,796
Securities available for sale, amortized cost	420,784,178	454,166,979
Securities available for sale, gross unrealized gains	3,375,606	3,360,874
Securities available for sale, gross unrealized losses	(1,901,684)	(5,868,223)
Securities available for sale, fair value	422,258,100us-gaap_AvailableForSaleSecurities	451,659,630us-gaap_AvailableForSaleSecurities
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities [Line Items]
Securities held to maturity, amortized cost	214,096,171	198,829,574
Securities held to maturity, gross unrealized gains	2,303,569	2,420,298
Securities held to maturity, gross unrealized losses	(1,812,743)	(1,186,076)
Securities held to maturity, fair value	214,586,997	200,063,796
Securities available for sale, amortized cost	28,649,282	29,408,740
Securities available for sale, gross unrealized gains	1,107,755	1,053,713
Securities available for sale, gross unrealized losses	(43,723)	(62,472)
Securities available for sale, fair value	29,713,314	30,399,981
Other Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities [Line Items]
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, amortized cost	1,370,532	1,342,554
Securities available for sale, gross unrealized gains	630,797	625,145
Securities available for sale, gross unrealized losses	(98)	(846)
Securities available for sale, fair value	2,001,231	1,966,853
US Government Agencies Debt Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities [Line Items]
Securities available for sale, amortized cost	300,131,663	312,959,760
Securities available for sale, gross unrealized gains	444,159	173,685
Securities available for sale, gross unrealized losses	(1,395,567)	(5,263,873)
Securities available for sale, fair value	299,180,255	307,869,572
Residential Mortgage Backed Securities [Member]
Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities [Line Items]
Securities available for sale, amortized cost	90,632,701	110,455,925
Securities available for sale, gross unrealized gains	1,192,895	1,508,331
Securities available for sale, gross unrealized losses	(462,296)	(541,032)
Securities available for sale, fair value	$ 91,363,300	$ 111,423,224

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

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

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