Note 8 - Fair Value (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements at Reporting Date Using
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
June 30, 2013:
Securities available for sale:
U.S. govt. sponsored agency securities	$	380,915,891	$	-	$	380,915,891	$	-
Residential mortgage-backed and related securities		178,545,554		-		178,545,554		-
Municipal securities		36,828,850		-		36,828,850		-
Trust preferred securities		216,200		-		216,200		-
Other securities		1,758,905		264,869		1,494,036		-
	$	598,265,400	$	264,869	$	598,000,531	$	-
December 31, 2012:
Securities available for sale:
U.S. govt. sponsored agency securities	$	338,609,371	$	-	$	338,609,371	$	-
Residential mortgage-backed and related securities		163,601,103		-		163,601,103		-
Municipal securities		26,185,736		-		26,185,736		-
Trust preferred securities		139,400		-		139,400		-
Other securities		1,624,376		234,453		1,389,923		-
	$	530,159,986	$	234,453	$	529,925,533	$	-

			Fair Value Measurements at Reporting Date Using
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Impaired loans/leases	$	16,005,797	$	-	$	-	$	16,005,797
Other real estate owned		4,167,319		-		-		4,167,319
	$	20,173,116	$	-	$	-	$	20,173,116
December 31, 2012:
Impaired loans/leases	$	18,054,234	$	-	$	-	$	18,054,234
Other real estate owned		4,270,901		-		-		4,270,901
	$	22,325,135	$	-	$	-	$	22,325,135

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value	As of June 30, 2013				As of December 31, 2012
	Hierarchy	Carrying		Estimated		Carrying		Estimated
	Level	Value		Fair Value		Value		Fair Value
Cash and due from banks	Level 1	$	44,316,890	$	44,316,890	$	61,568,446	$	61,568,446
Federal funds sold	Level 2		16,666,000		16,666,000		26,560,000		26,560,000
Interest-bearing deposits at financial institutions	Level 2		34,573,775		34,573,775		22,359,490		22,359,490
Investment securities:
Held to maturity	Level 3		105,201,749		99,500,594		72,079,385		73,005,706
Available for sale	See Previous Table		598,265,400		598,265,400		530,159,986		530,159,986
Loans/leases receivable, net	Level 3		14,820,182		16,005,797		16,716,883		18,054,234
Loans/leases receivable, net	Level 2		1,494,749,541		1,496,225,203		1,250,745,552		1,262,090,766
Deposits:
Nonmaturity deposits	Level 2		1,204,708,666		1,204,708,666		1,039,572,326		1,039,572,326
Time deposits	Level 2		512,071,244		517,791,000		334,541,774		337,343,000
Short-term borrowings	Level 2		157,186,204		157,186,204		171,082,961		171,082,961
Federal Home Loan Bank advances	Level 2		209,949,500		221,501,000		202,350,000		220,815,000
Other borrowings	Level 2		142,644,062		154,228,000		138,239,762		154,101,000
Junior subordinated debentures	Level 2		40,210,175		27,856,246		36,085,000		18,786,000