Note 2 - Investment Securities (Details) - Gross Unrealized Losses and Fair Value of Securities in a Continuous Unrealized Loss Position (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Securities available for sale:
Available for Sale Securities less than 12 months fair value	$ 417,394,320	$ 441,808,604
Available for Sale Securities less than 12 months gross unrealized losses	(14,769,120)	(22,813,786)
Available for Sale Securities 12 months or more fair value	34,224,213	26,081,796
Available for Sale Securities 12 months or more gross unrealized losses	(1,845,235)	(1,941,536)
Available for Sale Securities fair value	451,618,533	467,890,400
Available for Sale Securities gross unrealized losses	(16,614,355)	(24,755,322)
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Held to Maturity Securities less than 12 months fair value	90,268,363	101,983,602
Held to Maturity Securities less than 12 months gross unrealized losses	(3,972,217)	(6,711,240)
Held to Maturity Securities 12 months or more fair value	11,141,166	2,697,375
Held to Maturity Securities 12 months or more gross unrealized losses	(795,903)	(400,339)
Held to Maturity Securities fair value	101,409,529	104,680,977
Held to Maturity Securities gross unrealized losses	(4,768,120)	(7,111,579)
Securities available for sale:
Available for Sale Securities less than 12 months fair value	12,715,294	13,890,692
Available for Sale Securities less than 12 months gross unrealized losses	(372,659)	(724,939)
Available for Sale Securities 12 months or more fair value	1,699,797	985,687
Available for Sale Securities 12 months or more gross unrealized losses	(44,367)	(53,385)
Available for Sale Securities fair value	14,415,091	14,876,379
Available for Sale Securities gross unrealized losses	(417,026)	(778,324)
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	330,406,007	333,194,820
Available for Sale Securities less than 12 months gross unrealized losses	(12,809,546)	(19,141,077)
Available for Sale Securities 12 months or more fair value	11,194,076	10,978,390
Available for Sale Securities 12 months or more gross unrealized losses	(786,261)	(1,001,764)
Available for Sale Securities fair value	341,600,083	344,173,210
Available for Sale Securities gross unrealized losses	(13,595,807)	(20,142,841)
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	74,273,019	94,723,092
Available for Sale Securities less than 12 months gross unrealized losses	(1,586,915)	(2,947,770)
Available for Sale Securities 12 months or more fair value	21,330,340	14,117,719
Available for Sale Securities 12 months or more gross unrealized losses	(1,014,607)	(886,387)
Available for Sale Securities fair value	95,603,359	108,840,811
Available for Sale Securities gross unrealized losses	$ (2,601,522)	$ (3,834,157)