Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Dec. 31, 2013	Dec. 31, 2012
Securities held to maturity:
Due in one year or less	$ 2,250,529
Due in one year or less	2,250,467
Due after one year through five years	9,340,352
Due after one year through five years	9,309,433
Due after five years	133,861,014
Due after five years	127,080,205
	145,451,895
	138,640,105	73,005,706
Securities available for sale:
Due in one year or less	6,416,406
Due in one year or less	6,426,654
Due after one year through five years	46,861,212
Due after one year through five years	46,420,946
Due after five years	359,110,380
Due after five years	339,584,244
	412,387,998
	392,431,844
Securities with no stated maturity date, amortized cost	573,870,562
Securities with no stated maturity date, fair value	551,758,458
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	160,110,199
Securities with no stated maturity date, fair value	157,429,451
Other Securities [Member]
Securities held to maturity:
	1,050,000	650,000
Securities available for sale:
Securities with no stated maturity date, amortized cost	1,372,365
Securities with no stated maturity date, fair value	1,897,163
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
	137,590,105	72,355,706
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	22,760,530
Securities with no stated maturity date, fair value	22,574,232
Securities held to maturity:
Municipal securities	108,408,593
Municipal securities	102,628,515
US Government-sponsored Enterprises Debt Securities [Member] | Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	335,565,915
Securities with no stated maturity date, fair value	317,138,253
Callable Securities [Member]
Securities available for sale:
Securities with no stated maturity date, amortized cost	358,326,445
Securities with no stated maturity date, fair value	$ 339,712,485