Note 2 - Investment Securities (Tables)

9 Months Ended

Sep. 30, 2012

Unrealized Gain (Loss) on Investments [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
September 30, 2012:
Securities held to maturity:
Other bonds	$	650,000	$	-	$	-		$	650,000
Securities available for sale:
U.S. govt. sponsored agency securities	$	340,538,125	$	2,712,996	$	(7,499	)	$	343,243,622
Residential mortgage-backed and related securities		151,264,044		4,450,612		(24,081	)		155,690,575
Municipal securities		87,579,277		2,478,687		(26,333	)		90,031,631
Trust preferred securities		86,200		44,200		-			130,400
Other securities		1,329,191		301,728		(25,698	)		1,605,221
	$	580,796,837	$	9,988,223	$	(83,611	)	$	590,701,449
December 31, 2011:
Securities held to maturity:
Other bonds	$	200,000	$	-	$	-		$	200,000
Securities available for sale:
U.S. govt. sponsored agency securities	$	426,581,913	$	2,428,994	$	(55,687	)	$	428,955,220
Residential mortgage-backed and related securities		105,373,614		3,488,350		(8,215	)		108,853,749
Municipal securities		23,937,118		1,752,246		-			25,689,364
Trust preferred securities		86,200		-		(5,400	)		80,800
Other securities		1,354,940		140,022		(44,804	)		1,450,158
	$	557,333,785	$	7,809,612	$	(114,106	)	$	565,029,291

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
September 30, 2012:
Securities available for sale:
U.S. govt. sponsored agency securities	$	10,988,570	$	(7,499	)	$	-	$	-		$	10,988,570	$	(7,499	)
Residential mortgage-backed and related securities		5,430,389		(24,081	)		-		-			5,430,389		(24,081	)
Municipal securities		3,455,797		(26,333	)		-		-			3,455,797		(26,333	)
Other securities		-		-			215,000		(25,698	)		215,000		(25,698	)
	$	19,874,756	$	(57,913	)	$	215,000	$	(25,698	)	$	20,089,756	$	(83,611	)
December 31, 2011:
Securities available for sale:
U.S. govt. sponsored agency securities	$	59,979,620	$	(55,687	)	$	-	$	-		$	59,979,620	$	(55,687	)
Residential mortgage-backed and related securities		4,906,398		(8,215	)		-		-			4,906,398		(8,215	)
Trust preferred securities		-		-			80,800		(5,400	)		80,800		(5,400	)
Other securities		251,957		(44,332	)		2,778		(472	)		254,735		(44,804	)
	$	65,137,975	$	(108,234	)	$	83,578	$	(5,872	)	$	65,221,553	$	(114,106	)

Realized Gain (Loss) on Investments [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
Proceeds from sales of securities	$	-	$	8,601,107	$	19,215,075	$	54,326,191
Pre-tax gross gains from sales of securities		-		443,614		104,600		1,472,528

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Securities held to maturity:
Due in one year or less	$	100,000	$	100,000
Due after one year through five years		550,000		550,000
	$	650,000	$	650,000
Securities available for sale:
Due in one year or less	$	2,251,717	$	2,257,998
Due after one year through five years		40,236,390		40,681,663
Due after five years		385,715,495		390,465,992
	$	428,203,602	$	433,405,653
Residential mortgage-backed and related securities		151,264,044		155,690,575
Other securities		1,329,191		1,605,221
	$	580,796,837	$	590,701,449