Note 10 - Fair Value (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

			Fair Value Measurements at Reporting Date Using
			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable
			Identical Assets		Inputs		Inputs
	Fair Value		(Level 1)		(Level 2)		(Level 3)
June 30, 2015:
Securities available for sale:
U.S. govt. sponsored agency securities	$	256,443,661	$	-	$	256,443,661	$	-
Residential mortgage-backed and related securities		80,843,822		-		80,843,822		-
Municipal securities		27,903,703		-		27,903,703		-
Other securities		2,038,597		370,983		1,667,614		-
Derivative instruments		1,223,973		-		1,223,973		-
	$	368,453,756	$	370,983	$	368,082,773	$	-
December 31, 2014:
Securities available for sale:
U.S. govt. sponsored agency securities	$	307,869,572	$	-	$	307,869,572	$	-
Residential mortgage-backed and related securities		111,423,224		-		111,423,224		-
Municipal securities		30,399,981		-		30,399,981		-
Other securities		1,966,853		345,952		1,620,901		-
Derivative instruments		1,487,386		-		1,487,386
	$	453,147,016	$	345,952	$	452,801,064	$	-

			Fair Value Measurements at Reporting Date Using
	Fair Value		Level 1		Level 2		Level 3
June 30, 2015:
Impaired loans/leases	$	4,508,716	$	-	$	-	$	4,508,716
OREO		12,908,186		-		-		12,908,186
	$	17,416,902	$	-	$	-	$	17,416,902
December 31, 2014:
Impaired loans/leases	$	12,467,362	$	-	$	-	$	12,467,362
OREO		13,789,047		-		-		13,789,047
	$	26,256,409	$	-	$	-	$	26,256,409

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

	Quantitave Information about Level Fair Value Measurments
	Fair Value		Valuation Technique	Unobservable Input	Range
June 30, 2015:
Impaired loans/leases	$	4,508,716	Appraisal of collateral	Appraisal adjustments		-10.00%	to	-50.00%
OREO		12,908,186	Appraisal of collateral	Appraisal adjustments		0.00%	to	-35.00%

	Quantitave Information about Level Fair Value Measurments
	Fair Value		Valuation Technique	Unobservable Input	Range
December 31, 2014:
Impaired loans/leases	$	12,467,362	Appraisal of collateral	Appraisal adjustments		-10.00%	to	-50.00%
OREO		13,789,047	Appraisal of collateral	Appraisal adjustments		0.00%	to	-35.00%

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

	Fair Value	As of June 30, 2015				As of December 31, 2014
	Hierarchy	Carrying		Estimated		Carrying		Estimated
	Level	Value		Fair Value		Value		Fair Value
Cash and due from banks	Level 1	$	39,994,818	$	39,994,818	$	38,235,019	$	38,235,019
Federal funds sold	Level 2		22,555,000		22,555,000		46,780,000		46,780,000
Interest-bearing deposits at financial institutions	Level 2		47,682,823		47,682,823		35,334,682		35,334,682
Investment securities:
Held to maturity	Level 3		225,138,234		223,541,181		199,879,574		201,113,796
Available for sale	See Previous Table		367,229,783		367,229,783		451,659,630		451,659,630
Loans/leases receivable, net	Level 3		4,174,737		4,508,716		11,543,854		12,467,362
Loans/leases receivable, net	Level 2		1,685,063,461		1,691,009,263		1,595,384,851		1,606,646,146
Derivative instruments	Level 2		1,223,973		1,223,973		1,487,386		1,487,386
Deposits:
Nonmaturity deposits	Level 2		1,419,075,749		1,419,075,749		1,304,044,099		1,304,044,099
Time deposits	Level 2		417,691,321		418,228,000		375,623,914		376,509,000
Short-term borrowings	Level 2		168,574,852		168,574,852		268,351,670		268,351,670
FHLB advances	Level 2		132,500,000		135,688,000		203,500,000		208,172,000
Other borrowings	Level 2		115,000,000		122,312,000		150,282,492		159,741,000
Junior subordinated debentures	Level 2		40,492,319		28,792,716		40,423,735		28,585,294