Note 6 - Fair Value (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [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)
March 31, 2014:
Securities available for sale:
U.S. govt. sponsored agency securities	$	350,337,559	$	-	$	350,337,559	$	-
Residential mortgage-backed and related securities		158,119,401		-		158,119,401		-
Municipal securities		35,076,066		-		35,076,066		-
Other securities		1,944,511		317,137		1,627,374		-
	$	545,477,537	$	317,137	$	545,160,400	$	-
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
March 31, 2014:
Impaired loans/leases	$	7,524,198	$	-	$	-	$	7,524,198
Other real estate owned		10,448,606		-		-		10,448,606
	$	17,972,804	$	-	$	-	$	17,972,804
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
March 31, 2014:
Impaired loans/leases	$	7,524,198	Appraisal of collateral	Appraisal adjustments	-10.00%	to	-50.00	%
Other real estate owned		10,448,606	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 March 31, 2014				As of December 31, 2013
	Hierarchy Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Cash and due from banks	Level 1	$	55,444,302	$	55,444,302	$	41,950,790	$	41,950,790
Federal funds sold	Level 2		11,570,000		11,570,000		39,435,000		39,435,000
Interest-bearing deposits at financial institutions	Level 2		44,389,277		44,389,277		33,044,917		33,044,917
Investment securities:
Held to maturity	Level 3		161,629,152		157,617,860		145,451,895		138,640,105
Available for sale	See Previous Table		545,477,537		545,477,537		551,758,458		551,758,458
Loans/leases receivable, net	Level 3		6,966,850		7,524,198		8,342,182		9,009,557
Loans/leases receivable, net	Level 2		1,462,959,422		1,472,150,150		1,430,489,328		1,441,952,443
Deposits:
Nonmaturity deposits	Level 2		1,296,408,620		1,296,408,620		1,256,209,352		1,256,209,352
Time deposits	Level 2		375,485,023		376,596,000		390,781,891		391,923,000
Short-term borrowings	Level 2		165,569,112		165,569,112		149,292,967		149,292,967
Federal Home Loan Bank advances	Level 2		235,700,000		245,555,000		231,350,000		241,623,000
Other borrowings	Level 2		142,250,644		152,184,000		142,448,362		152,761,000
Junior subordinated debentures	Level 2		40,322,765		28,218,054		40,289,830		28,094,228