Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $)	Sep. 30, 2013	Dec. 31, 2012
Securities held to maturity:
Due in one year or less	$ 2,066,615
Due in one year or less	2,066,245
Due after one year through five years	9,982,269
Due after one year through five years	9,827,587
Due after one year through five years	119,312,961
Due after one year through five years	113,398,530
	131,361,845
	125,292,362	73,005,706
Securities available for sale:
Due in one year or less	5,220,265
Due in one year or less	5,231,685
Due after one year through five years	42,271,445
Due after one year through five years	42,124,141
Due after five years	371,944,101
Due after five years	356,628,231
	419,435,811
	403,984,057
Securities available for sale, amortized cost	372,788,252
Securities available for sale, fair value	357,691,161
	588,553,625	522,547,519
	572,337,329	530,159,986
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	167,759,290
Securities available for sale, fair value	166,544,470
	167,759,290	160,035,196
	166,544,470	163,601,103
Equity Securities, Other [Member]
Securities held to maturity:
	1,045,260	650,000
Securities available for sale:
Securities available for sale, amortized cost	1,358,524
Securities available for sale, fair value	1,808,802
	1,358,524	1,347,113
	1,808,802	1,624,376
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
	124,247,102	72,355,706
Securities available for sale:
Securities available for sale, amortized cost	23,163,866
Securities available for sale, fair value	22,996,424
	36,242,570	24,508,015
	36,459,170	26,185,736
Securities held to maturity:
Municipal securities	94,833,231
Municipal securities	89,637,985
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale, amortized cost	349,624,386
Securities available for sale, fair value	$ 334,694,737