Note 4 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 1,623,338,950		$ 1,455,732,633
Plus deferred loan/lease orgination costs, net of fees	6,664,120		4,546,925
Gross loans/leases receivable	1,630,003,070		1,460,279,558
Less allowance for estimated losses on loans/leases	(23,074,365)		(21,448,048)		(19,925,204)	(18,789,262)
Net loans/leases receivable	1,606,928,705		1,438,831,510
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	523,927,140		431,688,129
Less allowance for estimated losses on loans/leases	(8,750,317)		(5,648,774)		(4,531,545)	(4,878,006)
Owner-Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	260,069,080		261,215,912
Commercial Construction, Land Development, and Other Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	68,118,989		57,844,902
Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	373,952,353		352,692,115
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	702,140,422		671,752,929
Less allowance for estimated losses on loans/leases	(8,353,386)		(10,705,434)		(11,069,502)	(10,596,958)
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	166,032,416	[1]	128,901,442	[1]
Plus deferred loan/lease orgination costs, net of fees	6,639,244	[1]	4,814,183	[1]
Gross loans/leases receivable	172,671,660	[1]	133,715,625	[1]
Less allowance for estimated losses on loans/leases	(3,442,915)	[1]	(2,517,217)	[1]	(1,990,395)	(1,339,496)
Net loans/leases receivable	169,228,745	[1]	131,198,408	[1]
* Direct financing leases:
Net minimum lease payments to be received	188,181,432	[1]	145,662,254	[1]
Estimated unguaranteed residual values of leased assets	1,488,342	[1]	1,694,499	[1]
Unearned lease/residual income	(23,637,358)	[1]	(18,455,311)	[1]
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	158,632,492	[2]	147,356,323	[2]
Less allowance for estimated losses on loans/leases	(1,525,952)		(1,395,849)		(1,070,328)	(704,946)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	72,606,480		76,033,810
Less allowance for estimated losses on loans/leases	$ (1,001,795)		$ (1,180,774)		$ (1,263,434)	$ (1,269,856)

[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. There were no losses related to residual values during the years ended December 31, 2014, 2013, and 2012. At December 31, 2014, the Company had 27 leases remaining with residual values totaling $1,488,342 that were not protected with a lease end options rider. At December 31, 2013, the Company had 33 leases remaining with residual values totaling $1,694,499 that were not protected with a lease end options rider. Management has performed specific evaluations of these residual values and determined that the valuations are appropriate.

[2] Includes residential real estate loans held for sale totaling $553,000 and $1,358,290 as of December 31, 2014 and 2013, respectively.