Note 21 - Fair Value (Tables)

12 Months Ended

Dec. 31, 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)
December 31, 2015:
Securities available for sale:
U.S. govt. sponsored agency securities	$	213,537,379	$	-	$	213,537,379	$	-
Residential mortgage-backed securities		80,670,135		-		80,670,135		-
Municipal securities		27,578,588		-		27,578,588		-
Other securities		1,648,880		411		1,648,469		-
Derivative instruments		856,024		-		856,024		-
	$	324,291,006	$	411	$	324,290,595	$	-
December 31, 2014:
Securities available for sale:
U.S. govt. sponsored agency securities	$	307,869,572	$	-	$	307,869,572	$	-
Residential mortgage-backed 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		1,487,387		-		1,487,387		-
	$	453,147,017	$	345,952	$	452,801,065	$	-

			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)
December 31, 2015:
Impaired loans/leases	$	4,545,966	$	-	$	-	$	4,545,966
Other real estate owned		7,722,711		-		-		7,722,711
	$	12,268,677	$	-	$	-	$	12,268,677
December 31, 2014:
Impaired loans/leases	$	12,467,362	$	-	$	-	$	12,467,362
Other real estate owned		13,789,047		-		-		13,789,047
	$	26,256,409	$	-	$	-	$	26,256,409

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

	Quantitative Information about Level Fair Value Measurements
	December 31, 2015 Fair Value		December 31, 2014 Fair Value		Valuation Technique	Unobservable Input	Range
Impaired loans/leases	$	4,545,966	$	12,467,362	Appraisal of collateral	Appraisal adjustments	-10.00%	to	-50.00%
Other real estate owned		7,722,711		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 December 31, 2015				As of December 31, 2014
	Hierarchy Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Cash and due from banks	Level 1	$	41,957,855	$	41,957,855	$	38,235,019	$	38,235,019
Federal funds sold	Level 2		19,850,000		19,850,000		46,780,000		46,780,000
Interest-bearing deposits at financial institutions	Level 2		36,098,431		36,098,431		35,334,682		35,334,682
Investment securities:
Held to maturity	Level 2		253,674,159		255,691,285		199,879,574		201,113,796
Available for sale	See Previous Table		323,434,982		323,434,982		451,659,630		451,659,630
Loans/leases receivable, net	Level 3		4,209,228		4,545,966		11,543,853		12,467,362
Loans/leases receivable, net	Level 2		1,767,672,541		1,764,178,772		1,595,384,852		1,606,646,146
Derivative instruments	Level 2		856,024		856,024		1,487,387		1,487,387
Deposits:
Nonmaturity deposits	Level 2		1,516,599,081		1,516,599,081		1,304,044,099		1,304,044,099
Time deposits	Level 2		364,067,103		364,192,000		375,623,914		376,509,000
Short-term borrowings	Level 2		144,662,716		144,662,716		268,351,670		268,351,670
Federal Home Loan Bank advances	Level 2		151,000,000		153,143,000		203,500,000		208,172,000
Other borrowings	Level 2		110,000,000		116,061,000		150,282,492		159,741,000
Junior subordinated debentures	Level 2		38,499,052		27,642,093		40,423,735		28,585,294