Note 4 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio - USD ($)		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		$ 1,790,286,285		$ 1,623,338,950
Plus deferred loan/lease orgination costs, net of fees		7,736,390		6,664,120
Gross loans/leases receivable		1,798,022,675		1,630,003,070
Less allowance for estimated losses on loans/leases		(26,140,906)		(23,074,365)		$ (21,448,048)	$ (19,925,204)
		1,771,881,769		1,606,928,705
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		648,159,892		523,927,140
Less allowance for estimated losses on loans/leases		(10,484,080)		(8,833,832)		(5,648,774)	(4,531,545)
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		724,368,765		702,140,422
Less allowance for estimated losses on loans/leases		(9,375,117)		(8,353,386)		(10,705,434)	(11,069,502)
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		252,523,164		260,069,080
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		49,083,844		68,118,989
Commercial Real Estate Portfolio Segment [Member] | Other Non Owner-occupied Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		422,761,757		373,952,353
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[1],[2]	173,655,605		166,032,416
Plus deferred loan/lease orgination costs, net of fees	[1]	6,594,582		6,639,244
Gross loans/leases receivable	[1]	180,250,187		172,671,660
Less allowance for estimated losses on loans/leases		(3,395,088)	[1]	(3,359,400)	[1]	(2,517,217)	(1,990,395)
	[1]	176,855,099		169,312,260
Net minimum lease payments to be received	[1]	195,476,230		188,181,432
Estimated unguaranteed residual values of leased assets	[1]	1,165,706		1,488,342
Unearned lease/residual income	[1]	(22,986,331)		(23,637,358)
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[2],[3]	170,432,530		158,632,492
Less allowance for estimated losses on loans/leases		(1,790,150)		(1,525,952)		(1,395,849)	(1,070,328)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[2]	73,669,493		72,606,480
Less allowance for estimated losses on loans/leases		$ (1,096,471)		$ (1,001,795)		$ (1,180,774)	$ (1,263,434)

[1] Management performs an evaluation of the estimated unguaranteed residual values of leased assets on an annual basis, at a minimum. The evaluation consists ofdiscussions with reputable and current vendors and management's expertise and understanding of the current states of particular industries to determine informalvaluations 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 $565,850 and $553,000 as of December 31, 2015 and 2014, respectively.