Note 3 - Composition of the Loan Lease Portfolio (Details) - USD ($)		Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2015		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member]
Loans		$ 706,261,186			$ 648,159,892
Less allowance		(10,724,506)		$ (10,991,979)	(10,484,080)		$ (10,020,866)	$ (9,093,650)	$ (8,750,317)
		706,261,186			648,159,892
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans		258,688,445			252,523,164
		258,688,445			252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		48,948,825			49,083,844
		48,948,825			49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans		476,741,839			422,761,757
		476,741,839			422,761,757
Commercial Real Estate Portfolio Segment [Member]
Loans		784,379,109			724,368,765
Less allowance		(10,987,062)		(10,090,567)	(9,375,117)		(9,929,656)	(8,838,204)	(8,353,386)
		784,379,109			724,368,765
Finance Leases Portfolio Segment [Member]
Loans	[1],[2]	169,927,481			173,655,605
Plus deferred loan/lease origination costs, net of fees	[1]	6,339,871			6,594,582
Loans and Leases Receivable, Gross	[1]	176,267,352			180,250,187
Less allowance		(3,226,194)	[1]	(3,287,231)	(3,395,088)	[1]	(3,352,303)	(3,310,973)	(3,442,915)
	[1]	173,041,158			176,855,099
Net minimum lease payments to be received	[1]	190,107,687			195,476,230
Estimated unguaranteed residual values of leased assets	[1]	1,085,154			1,165,706
Unearned lease/residual income	[1]	(21,265,360)			(22,986,331)
	[1],[2]	169,927,481			173,655,605
Residential Portfolio Segment [Member]
Loans	[2],[3]	180,482,005			170,432,530
Less allowance		(2,014,987)		(1,836,622)	(1,790,150)		(1,720,135)	(1,597,754)	(1,525,952)
	[2],[3]	180,482,005			170,432,530
Consumer Portfolio Segment [Member]
Loans	[2]	73,658,172			73,669,493
Less allowance		(1,144,741)		(1,189,043)	(1,096,471)		(1,123,040)	(1,042,693)	(1,001,795)
	[2]	73,658,172			73,669,493
Loans		1,914,707,953			1,790,286,285
Plus deferred loan/lease origination costs, net of fees		8,065,444			7,736,390
Loans and Leases Receivable, Gross		1,922,773,397			1,798,022,675
Less allowance		(28,097,490)		$ (27,395,442)	(26,140,906)		$ (26,146,000)	$ (23,883,274)	$ (23,074,365)
		1,894,675,907			1,771,881,769
		$ 1,914,707,953			$ 1,790,286,285

[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 six months ended June 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 $1,558,500 and $565,850 as of June 30, 2016, and December 31, 2015, respectively.