Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Securities held to maturity:
Securities held to maturity, amortized cost	$ 145,451,895	$ 72,079,385
Securities held to maturity, gross unrealized gains	299,789	997,969
Securities held to maturity, gross unrealized losses	(7,111,579)	(71,648)
Securities held to maturity, fair value	138,640,105	73,005,706
Securities available for sale:
Available for Sale Securities, amortized cost	573,870,562	522,547,519
Available for Sale Securities, gross unrealized gains	2,643,218	7,985,963
Available for Sale Securities, gross unrealized losses	(24,755,322)	(373,496)
Available for Sale Securities, fair value	551,758,458	530,159,986
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Securities held to maturity, amortized cost	144,401,895	71,429,385
Securities held to maturity, gross unrealized gains	299,789	997,969
Securities held to maturity, gross unrealized losses	(7,111,579)	(71,648)
Securities held to maturity, fair value	137,590,105	72,355,706
Securities available for sale:
Available for Sale Securities, amortized cost	35,813,866	24,508,015
Available for Sale Securities, gross unrealized gains	923,315	1,696,555
Available for Sale Securities, gross unrealized losses	(778,324)	(18,834)
Available for Sale Securities, fair value	35,958,857	26,185,736
Other Securities [Member]
Securities held to maturity:
Securities held to maturity, amortized cost	1,050,000	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	1,050,000	650,000
Securities available for sale:
Available for Sale Securities, amortized cost	1,372,365	1,347,113
Available for Sale Securities, gross unrealized gains	524,798	300,732
Available for Sale Securities, gross unrealized losses		(23,469)
Available for Sale Securities, fair value	1,897,163	1,624,376
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for Sale Securities, amortized cost	376,574,132	336,570,995
Available for Sale Securities, gross unrealized gains	41,696	2,198,655
Available for Sale Securities, gross unrealized losses	(20,142,841)	(160,279)
Available for Sale Securities, fair value	356,472,987	338,609,371
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for Sale Securities, amortized cost	160,110,199	160,035,196
Available for Sale Securities, gross unrealized gains	1,153,409	3,736,821
Available for Sale Securities, gross unrealized losses	(3,834,157)	(170,914)
Available for Sale Securities, fair value	157,429,451	163,601,103
Trust Preferred Securities [Member]
Securities available for sale:
Available for Sale Securities, amortized cost		86,200
Available for Sale Securities, gross unrealized gains		53,200
Available for Sale Securities, fair value		$ 139,400