Note 2 - Investment Securities (Detail) - Amortized Cost and Fair Value of Investment Securities (USD $)	Mar. 31, 2013	Mar. 13, 2013	Dec. 31, 2012
Securities held to maturity:
Securities held to maturity amortized cost	$ 87,006,209	$ 87,006,209	$ 72,079,385
Securities held to maturity gross unrealized gains		746,173	997,969
Securities held to maturity gross unrealized losses		(407,348)	(71,648)
Securities held to maturity fair value		87,345,034	73,005,706
Securities available for sale:
Securities available for sale amortized cost	599,289,459	599,289,459	522,547,519
Securities available for sale gross unrealized gains		7,160,504	7,985,963
Securities available for sale gross unrealized losses		(904,589)	(373,496)
Securities available for sale fair value	605,545,374	605,545,374	530,159,986
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Securities held to maturity amortized cost		86,356,209	71,429,385
Securities held to maturity gross unrealized gains		746,173	997,969
Securities held to maturity gross unrealized losses		(407,348)	(71,648)
Securities held to maturity fair value		86,695,034	72,355,706
Securities available for sale:
Securities available for sale amortized cost		23,485,794	24,508,015
Securities available for sale gross unrealized gains		1,543,985	1,696,555
Securities available for sale gross unrealized losses		(38,738)	(18,834)
Securities available for sale fair value		24,991,041	26,185,736
Equity Securities, Other [Member]
Securities held to maturity:
Securities held to maturity amortized cost		650,000	650,000
Securities held to maturity gross unrealized gains		0	0
Securities held to maturity gross unrealized losses		0	0
Securities held to maturity fair value		650,000	650,000
Securities available for sale:
Securities available for sale amortized cost		1,365,794	1,347,113
Securities available for sale gross unrealized gains		366,719	300,732
Securities available for sale gross unrealized losses		(5,664)	(23,469)
Securities available for sale fair value		1,726,849	1,624,376
US Government-sponsored Enterprises Debt Securities [Member]
Securities available for sale:
Securities available for sale amortized cost		402,488,606	336,570,995
Securities available for sale gross unrealized gains		1,769,562	2,198,655
Securities available for sale gross unrealized losses		(418,236)	(160,279)
Securities available for sale fair value		403,839,932	338,609,371
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale amortized cost		171,863,065	160,035,196
Securities available for sale gross unrealized gains		3,381,118	3,736,821
Securities available for sale gross unrealized losses		(441,951)	(170,914)
Securities available for sale fair value		174,802,232	163,601,103
Trust preferred securities [Member]
Securities available for sale:
Securities available for sale amortized cost		86,200	86,200
Securities available for sale gross unrealized gains		99,120	53,200
Securities available for sale gross unrealized losses		0	0
Securities available for sale fair value		$ 185,320	$ 139,400

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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 of investments in debt securities categorized as held-to-maturity valued at amortized cost, excludes other than temporary impairment (OTTI).

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