Note 3 - Loans Leases Receivable - Composition of the Loan Lease Portfolio (Details) - USD ($)		Sep. 30, 2016		Jun. 30, 2016	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member]
Loans		$ 804,307,562			$ 648,159,892
Less allowance		(11,557,966)		$ (10,724,506)	(10,484,080)		$ (10,532,168)	$ (10,020,866)	$ (8,750,317)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans		317,899,011			252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		160,527,094			49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans		591,878,656			422,761,757
Commercial Real Estate Portfolio Segment [Member]
Loans		1,070,304,761			724,368,765
Less allowance		(11,002,524)		(10,987,062)	(9,375,117)		(8,708,715)	(9,929,656)	(8,353,386)
Finance Leases Portfolio Segment [Member]
Loans	[1],[2]	166,924,077			173,655,605
Plus deferred loan/lease origination costs, net of fees	[1]	6,018,484			6,594,582
Gross loans/leases receivable	[1]	172,942,561			180,250,187
Less allowance		(3,041,962)	[1]	(3,226,194)	(3,395,088)	[1]	(3,248,633)	(3,352,303)	(3,442,915)
	[1]	169,900,599			176,855,099
Net minimum lease payments to be received	[1]	186,183,516			195,476,230
Estimated unguaranteed residual values of leased assets	[1]	1,085,154			1,165,706
Unearned lease/residual income	[1]	(20,344,593)			(22,986,331)
Residential Portfolio Segment [Member]
Loans	[2],[3]	229,080,600			170,432,530
Less allowance		(2,055,654)		(2,014,987)	(1,790,150)		(1,829,056)	(1,720,135)	(1,525,952)
Consumer Portfolio Segment [Member]
Loans	[2]	81,917,732			73,669,493
Less allowance		(1,168,729)		(1,144,741)	(1,096,471)		(1,215,772)	(1,123,040)	(1,001,795)
Loans		2,352,534,732			1,790,286,285
Plus deferred loan/lease origination costs, net of fees		8,065,780			7,736,390
Gross loans/leases receivable		2,360,600,512			1,798,022,675
Less allowance		(28,826,835)		$ (28,097,490)	(26,140,906)		$ (25,534,344)	$ (26,146,000)	$ (23,074,365)
		$ 2,331,773,677			$ 1,771,881,769

[1] Management performs an evaluation of the estimated unguaranteed residual values of leased assets on an annual basis, at a minimum. The evaluation consists of discussions with reputable and current vendors, which is combined with management’s expertise and understanding of the current states of particular industries to determine informal valuations of the equipment. As necessary and where available, management will utilize valuations by independent appraisers. The large majority of leases with residual values contain a lease options rider, which requires the lessee to pay the residual value directly, finance the payment of the residual value, or extend the lease term to pay the residual value. In these cases, the residual value is protected and the risk of loss is minimal. There were no losses related to residual values for the three and nine months ended September 30, 2016 and 2015.

[2] Performing = loans/leases accruing and less than 90 days past due. Nonperforming = loans/leases on nonaccrual, accruing loans/leases that are greater than or equal to 90 days past due, and accruing TDRs.

[3] Includes residential real estate loans held for sale totaling $1,377,875 and $565,850 as of September 30, 2016, and December 31, 2015, respectively.