Note 6 - Fair Value (Tables)

9 Months Ended

Sep. 30, 2014

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, 2014:
Securities available for sale:
U.S. govt. sponsored agency securities	$	306,004,605	$	-	$	306,004,605	$	-
Residential mortgage-backed and related securities		127,779,749		-		127,779,749		-
Municipal securities		31,260,146		-		31,260,146		-
Other securities		1,900,067		317,021		1,583,046		-
Derivative instruments		1,848,119		-		1,848,119		-
	$	468,792,686	$	317,021	$	468,475,665	$	-
December 31, 2013:
Securities available for sale:
U.S. govt. sponsored agency securities	$	356,472,987	$	-	$	356,472,987	$	-
Residential mortgage-backed and related securities		157,429,451		-		157,429,451		-
Municipal securities		35,958,857		-		35,958,857		-
Other securities		1,897,163		317,698		1,579,465		-
	$	551,758,458	$	317,698	$	551,440,760	$	-

			Fair Value Measurements at Reporting Date Using
	Fair Value		Level 1		Level 2		Level 3
September 30, 2014:
Impaired loans/leases	$	13,616,631	$	-	$	-	$	13,616,631
Other real estate owned		11,534,235		-		-		11,534,235
	$	25,150,866	$	-	$	-	$	25,150,866
December 31, 2013:
Impaired loans/leases	$	9,009,557	$	-	$	-	$	9,009,557
Other real estate owned		10,507,377		-		-		10,507,377
	$	19,516,934	$	-	$	-	$	19,516,934

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

	Quantitave Information about Level Fair Value Measurments
	Fair Value		Valuation Technique	Unobservable Input	Range
September 30, 2014:
Impaired loans/leases	$	13,616,631	Appraisal of collateral	Appraisal adjustments	-10.00% to -50.00%
Other real estate owned		11,534,235	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, 2013:
Impaired loans/leases	$	9,009,557	Appraisal of collateral	Appraisal adjustments	-10.00% to -50.00%
Other real estate owned		10,507,377	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, 2014				As of December 31, 2013
	Hierarchy	Carrying		Estimated		Carrying		Estimated
	Level	Value		Fair Value		Value		Fair Value
Cash and due from banks	Level 1	$	42,326,177	$	42,326,177	$	41,950,790	$	41,950,790
Federal funds sold	Level 2		29,760,000		29,760,000		39,435,000		39,435,000
Interest-bearing deposits at financial institutions	Level 2		34,631,773		34,631,773		33,044,917		33,044,917
Investment securities:
Held to maturity	Level 3		185,840,139		185,936,051		145,451,895		138,640,105
Available for sale	See Previous Table		466,944,567		466,944,567		551,758,458		551,758,458
Loans/leases receivable, net	Level 3		12,607,992		13,616,631		8,342,182		9,009,557
Loans/leases receivable, net	Level 2		1,537,493,236		1,544,453,008		1,430,489,328		1,441,952,443
Derivative instruments	Level 2		1,848,119		1,848,119		-		-
Deposits:
Nonmaturity deposits	Level 2		1,298,921,913		1,298,921,913		1,256,209,352		1,256,209,352
Time deposits	Level 2		414,945,479		416,050,000		390,781,891		391,923,000
Short-term borrowings	Level 2		162,186,698		162,186,698		149,292,967		149,292,967
Federal Home Loan Bank advances	Level 2		196,500,000		202,507,000		231,350,000		241,623,000
Other borrowings	Level 2		151,455,209		160,531,000		142,448,362		152,761,000
Junior subordinated debentures	Level 2		40,389,809		28,457,573		40,289,830		28,094,228