Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Sep. 30, 2014	Dec. 31, 2013
Securities held to maturity:
Due in one year or less	$ 12,682,406
Due in one year or less	12,683,453
Due after one year through five years	16,825,667
Due after one year through five years	16,856,667
Due after five years	156,332,066
Due after five years	156,395,931
	185,840,139
	185,936,051	138,640,105
Securities available for sale:
Due in one year or less	3,649,998
Due in one year or less	3,664,418
Due after one year through five years	60,972,541
Due after one year through five years	60,242,076
Due after five years	280,607,350
Due after five years	273,358,257
	345,229,889
	337,264,751
Amortized Cost	474,406,289
Fair Value	466,944,567
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Amortized Cost	127,822,284
Fair Value	127,779,749
Other Securities [Member]
Securities held to maturity:
	1,050,000	1,050,000
Securities available for sale:
Amortized Cost	1,354,116
Fair Value	1,900,067
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member]
Securities available for sale:
Amortized Cost	18,473,306
Fair Value	18,985,950
Securities held to maturity:
Municipal securities	99,883,698
Municipal securities	100,074,857
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
	184,886,051	137,590,105
US Government-sponsored Enterprises Debt Securities [Member] | Callable Securities [Member]
Securities available for sale:
Amortized Cost	250,617,040
Fair Value	243,092,527
Callable Securities [Member]
Securities available for sale:
Amortized Cost	269,090,346
Fair Value	$ 262,078,477