Note 6 - Fair Value (Tables)

6 Months Ended

Jun. 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)
June 30, 2014:
Securities available for sale:
U.S. govt. sponsored agency securities	$	325,620,456	$	-	$	325,620,456	$	-
Residential mortgage-backed and related securities		153,895,214		-		153,895,214		-
Municipal securities		33,857,471		-		33,857,471		-
Other securities		1,961,956		318,370		1,643,586		-
Derivative instruments		1,820,501		-		1,820,501		-
	$	517,155,598	$	318,370	$	516,837,228	$	-
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
June 30, 2014:
Impaired loans/leases	$	8,281,725	$	-	$	-	$	8,281,725
Other real estate owned		11,827,311		-		-		11,827,311
	$	20,109,036	$	-	$	-	$	20,109,036
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
June 30, 2014:
Impaired loans/leases	$	8,281,725	Appraisal of collateral	Appraisal adjustments		-10.00% to -50.00	%
Other real estate owned		11,827,311	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 June 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	$	56,292,577	$	56,292,577	$	41,950,790	$	41,950,790
Federal funds sold	Level 2		20,490,000		20,490,000		39,435,000		39,435,000
Interest-bearing deposits at financial institutions	Level 2		36,786,049		36,786,049		33,044,917		33,044,917
Investment securities:
Held to maturity	Level 3		166,787,372		165,670,327		145,451,895		138,640,105
Available for sale	See Previous Table		517,155,598		517,155,598		551,758,458		551,758,458
Loans/leases receivable, net	Level 3		7,668,264		8,281,725		8,342,182		9,009,557
Loans/leases receivable, net	Level 2		1,518,632,461		1,521,236,736		1,430,489,328		1,441,952,443
Derivative Instruments	Level 2		1,820,501		1,820,501		-		-
Deposits:
Nonmaturity deposits	Level 2		1,291,304,395		1,291,304,395		1,256,209,352		1,256,209,352
Time deposits	Level 2		386,063,880		387,275,000		390,781,891		391,923,000
Short-term borrowings	Level 2		204,321,854		204,321,854		149,292,967		149,292,967
Federal Home Loan Bank advances	Level 2		222,900,000		235,770,000		231,350,000		241,623,000
Other borrowings	Level 2		151,452,927		162,038,000		142,448,362		152,761,000
Junior subordinated debentures	Level 2		40,356,154		28,332,467		40,289,830		28,094,228