Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Jun. 30, 2013	Dec. 31, 2012
Securities held to maturity:
Due in one year or less	$ 1,785,269
Due in one year or less	1,784,577
Due after one year through five years	10,214,545
Due after one year through five years	10,126,030
Due after one year through five years	93,201,935
Due after one year through five years	87,589,987
	105,201,749
	99,500,594	73,005,706
Securities available for sale:
Due in one year or less	5,334,543
Due in one year or less	5,329,272
Due after one year through five years	33,501,636
Due after one year through five years	33,339,485
Due after five years	393,242,895
Due after five years	379,292,184
	432,079,074
	417,960,941
Available for sale securities amortized cost	378,618,759
Available for sale securities fair value	364,820,607
	613,263,964	522,547,519
	598,265,400	530,159,986
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for sale securities amortized cost	179,822,160
Available for sale securities fair value	178,545,554
	179,822,160	160,035,196
	178,545,554	163,601,103
Equity Securities, Other [Member]
Securities held to maturity:
	650,000	650,000
Securities available for sale:
Available for sale securities amortized cost	1,362,730
Available for sale securities fair value	1,758,905
	1,362,730	1,347,113
	1,758,905	1,624,376
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
	98,850,594	72,355,706
Securities available for sale:
Available for sale securities amortized cost	22,786,922
Available for sale securities fair value	22,750,101
	36,478,946	24,508,015
	36,828,850	26,185,736
Securities held to maturity:
Municipal securities	69,862,451
Municipal securities	65,051,896
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for sale securities amortized cost	355,831,837
Available for sale securities fair value	$ 342,070,506