Note 21 - Fair Value (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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, 2017:
Securities available for sale:
U.S. govt. sponsored agency securities	$	38,096,534	$	-	$	38,096,534	$	-
Residential mortgage-backed securities		163,301,304		-		163,301,304		-
Municipal securities		66,625,496		-		66,625,496		-
Other securities		4,884,573		1,028		4,883,545		-
Interest rate caps		506,700		-		506,700		-
Interest rate swaps - assets		4,397,238		-		4,397,238
Total assets measured at fair value	$	277,811,845	$	1,028	$	277,810,817	$	-
Interest rate swaps - liabilities	$	4,397,238	$	-	$	4,397,238	$	-
Total liabilities measured at fair value	$	4,397,238	$	-	$	4,397,238	$	-
December 31, 2016:
Securities available for sale:
U.S. govt. sponsored agency securities	$	46,083,607	$	-	$	46,083,607	$	-
Residential mortgage-backed securities		147,702,127		-		147,702,127		-
Municipal securities		52,604,426		-		52,604,426		-
Other securities		4,722,979		1,361		4,721,618		-
Interest rate caps		576,527		-		576,527		-
Interest rate swaps - assets		2,338,281		-		2,338,281
Total assets measured at fair value	$	254,027,947	$	1,361	$	254,026,586	$	-
Interest rate swaps - liabilities	$	2,338,281	$	-	$	2,338,281	$	-
Total liabilities measured at fair value	$	2,338,281	$	-	$	2,338,281	$	-

			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, 2017:
Impaired loans/leases	$	8,972,337	$	-	$	-	$	8,972,337
Other real estate owned		14,642,973		-		-		14,642,973
	$	23,615,310	$	-	$	-	$	23,615,310
December 31, 2016:
Impaired loans/leases	$	12,823,121	$	-	$	-	$	12,823,121
Other real estate owned		5,964,952		-		-		5,964,952
	$	18,788,073	$	-	$	-	$	18,788,073

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

	Quantitative Information about Level Fair Value Measurements
	December 31, 2017 Fair Value		December 31, 2016 Fair Value		Valuation Technique	Unobservable Input	Range
Impaired loans/leases	$	8,972,337	$	12,823,121	Appraisal of collateral	Appraisal adjustments	-10.00%	to	-50.00%
Other real estate owned		14,642,973		5,964,952	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, 2017				As of December 31, 2016
	Hierarchy	Carrying		Estimated		Carrying		Estimated
	Level	Value		Fair Value		Value		Fair Value
Cash and due from banks	Level 1	$	75,721,663	$	75,721,663	$	70,569,993	$	70,569,993
Federal funds sold	Level 2		30,197,000		30,197,000		22,257,000		22,257,000
Interest-bearing deposits at financial institutions	Level 2		55,765,012		55,765,012		63,948,925		63,948,925
Investment securities:
HTM	Level 2		379,474,205		379,749,804		322,909,056		320,414,899
AFS	See Previous Table		272,907,907		272,907,907		251,113,139		251,113,139
Loans/leases receivable, net	Level 3		8,307,719		8,972,337		11,873,260		12,823,121
Loans/leases receivable, net	Level 2		2,921,821,953		2,892,963,000		2,362,856,277		2,344,462,740
Interest rate caps	Level 2		506,700		506,700		576,527		576,527
Interest rate swaps - assets	Level 2		4,397,238		4,397,238		2,338,281		2,338,281
Deposits:
Nonmaturity deposits	Level 2		2,670,583,178		2,670,583,178		2,188,683,349		2,188,683,349
Time deposits	Level 2		596,071,878		591,772,000		480,577,924		479,605,000
Short-term borrowings	Level 2		13,993,122		13,993,122		39,971,387		39,971,387
FHLB advances	Level 2		192,000,000		192,115,000		137,500,000		138,338,000
Other borrowings	Level 2		66,000,000		66,520,000		80,000,000		81,282,000
Junior subordinated debentures	Level 2		37,486,487		29,253,624		33,480,202		24,881,494
Interest rate swaps - liabilities	Level 2		4,397,238		4,397,238		2,338,281		2,338,281