Note 10 - Fair Value (Tables)

9 Months Ended

Sep. 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)
September 30, 2015:
Securities available for sale:
U.S. govt. sponsored agency securities	$	247,624,591	$	-	$	247,624,591	$	-
Residential mortgage-backed and related securities		74,901,559		-		74,901,559		-
Municipal securities		27,701,652		-		27,701,652		-
Other securities		1,906,549		354,128		1,552,421		-
Derivative instruments		784,655		-		784,655		-
	$	352,919,006	$	354,128	$	352,564,878	$	-
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
September 30, 2015:
Impaired loans/leases	$	4,849,718	$	-	$	-	$	4,849,718
OREO		8,791,506		-		-		8,791,506
	$	13,641,224	$	-	$	-	$	13,641,224
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 September 30, 2015		Fair Value December 31, 2014		Valuation Technique	Unobservable Input	Range
Impaired loans/leases	$	4,849,718	$	12,467,362	Appraisal of collateral	Appraisal adjustments	-10.00%	to	-50.00%
OREO		8,791,506		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 September 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	$	41,053,241	$	41,053,241	$	38,235,019	$	38,235,019
Federal funds sold	Level 2		34,330,000		34,330,000		46,780,000		46,780,000
Interest-bearing deposits at financial institutions	Level 2		32,275,631		32,275,631		35,334,682		35,334,682
Investment securities:
Held to maturity	Level 3		238,640,598		239,420,841		199,879,574		201,113,796
Available for sale	See Previous Table		352,134,351		352,134,351		451,659,630		451,659,630
Loans/leases receivable, net	Level 3		4,490,480		4,849,718		11,543,854		12,467,362
Loans/leases receivable, net	Level 2		1,725,647,545		1,735,872,520		1,595,384,851		1,606,646,146
Derivative instruments	Level 2		784,655		784,655		1,487,386		1,487,386
Deposits:
Nonmaturity deposits	Level 2		1,469,462,729		1,469,462,729		1,304,044,099		1,304,044,099
Time deposits	Level 2		385,856,258		386,900,000		375,623,914		376,509,000
Short-term borrowings	Level 2		167,564,212		167,564,212		268,351,670		268,351,670
FHLB advances	Level 2		133,000,000		135,877,000		203,500,000		208,172,000
Other borrowings	Level 2		115,000,000		123,363,000		150,282,492		159,741,000
Junior subordinated debentures	Level 2		40,526,691		28,887,138		40,423,735		28,585,294