Note 4 - Loans Leases Receivable - Composition of the Loan Lease Portfolio (Details) - USD ($)		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Loans		$ 2,397,414,282		$ 1,790,286,285
Plus deferred loan/lease origination costs, net of fees		8,072,703		7,736,390
Gross loans/leases receivable		2,405,486,985		1,798,022,675
Less allowance		(30,757,448)		(26,140,906)		$ (23,074,365)	$ (21,448,048)
		2,374,729,537		1,771,881,769
Commercial Portfolio Segment [Member]
Loans		827,637,263		648,159,892
Less allowance		(12,545,110)		(10,484,080)		(8,833,832)	(5,648,774)
Commercial Real Estate Portfolio Segment [Member]
Loans		1,093,458,860		724,368,765
Less allowance		(11,670,609)		(9,375,117)		(8,353,386)	(10,705,434)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans		332,387,621		252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		165,149,491		49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans		595,921,748		422,761,757
Finance Leases Portfolio Segment [Member]
Loans	[1],[2]	165,419,360		173,655,605
Plus deferred loan/lease origination costs, net of fees	[1]	5,881,778		6,594,582
Gross loans/leases receivable	[1]	171,301,138		180,250,187
Less allowance		(3,111,898)	[1]	(3,395,088)	[1]	(3,359,400)	(2,517,217)
	[1]	168,189,240		176,855,099
Net minimum lease payments to be received	[1]	184,274,802		195,476,230
Estimated unguaranteed residual values of leased assets	[1]	1,085,154		1,165,706
Unearned lease/residual income	[1]	(19,940,596)		(22,986,331)
Residential Portfolio Segment [Member]
Loans	[2],[3]	229,233,104		170,432,530
Less allowance		(2,342,344)		(1,790,150)		(1,525,952)	(1,395,849)
Consumer Portfolio Segment [Member]
Loans	[2]	81,665,695		73,669,493
Less allowance		$ (1,087,487)		$ (1,096,471)		$ (1,001,795)	$ (1,180,774)

[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 and 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.

[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 troubled debt restructurings.

[3] Includes residential real estate loans held for sale totaling $1,135,500 and $565,850 as of December 31, 2016 and 2015, respectively.