Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities (USD $)	Sep. 30, 2014	Dec. 31, 2013
Securities held to maturity:
Securities held to maturity, amortized cost	$ 185,840,139	$ 145,451,895
Securities held to maturity, gross unrealized gains	1,861,338	299,789
Securities held to maturity, gross unrealized losses	(1,765,426)	(7,111,579)
Securities held to maturity, fair value	185,936,051	138,640,105
Securities available for sale:
Available for Sale Securities, amortized cost	474,406,289	573,870,562
Available for Sale Securities, gross unrealized gains	3,098,794	2,643,218
Available for Sale Securities, gross unrealized losses	(10,560,516)	(24,755,322)
Available for sale securities	466,944,567	551,758,458
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Securities held to maturity, amortized cost	184,790,139	144,401,895
Securities held to maturity, gross unrealized gains	1,861,338	299,789
Securities held to maturity, gross unrealized losses	(1,765,426)	(7,111,579)
Securities held to maturity, fair value	184,886,051	137,590,105
Securities available for sale:
Available for Sale Securities, amortized cost	30,209,955	35,813,866
Available for Sale Securities, gross unrealized gains	1,149,656	923,315
Available for Sale Securities, gross unrealized losses	(99,465)	(778,324)
Available for sale securities	31,260,146	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, gross unrealized gains	0	0
Securities held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	1,050,000	1,050,000
Securities available for sale:
Available for Sale Securities, amortized cost	1,354,116	1,372,365
Available for Sale Securities, gross unrealized gains	545,951	524,798
Available for Sale Securities, gross unrealized losses	0	0
Available for sale securities	1,900,067	1,897,163
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for Sale Securities, amortized cost	315,019,934	376,574,132
Available for Sale Securities, gross unrealized gains	30,913	41,696
Available for Sale Securities, gross unrealized losses	(9,046,242)	(20,142,841)
Available for sale securities	306,004,605	356,472,987
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for Sale Securities, amortized cost	127,822,284	160,110,199
Available for Sale Securities, gross unrealized gains	1,372,274	1,153,409
Available for Sale Securities, gross unrealized losses	(1,414,809)	(3,834,157)
Available for sale securities	$ 127,779,749	$ 157,429,451