Note 4 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 1,455,732,633		$ 1,284,211,234
Plus deferred loan/lease origination costs	4,546,925		3,176,405
Total Loans/Leases plus deferred loan/lease origination costs	1,460,279,558		1,287,387,639
Less allowance for estimated losses on loans/leases	(21,448,048)		(19,925,204)		(18,789,262)	(20,364,656)
Loans/leases net of allowance for estimated losses	1,438,831,510		1,267,462,435
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	431,688,129		394,244,252
Less allowance for estimated losses on loans/leases	(5,648,774)		(4,531,545)		(4,878,006)	(7,548,922)
Owner-Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	261,215,912		204,911,308
Commercial Construction, Land Development, and Other Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	57,844,902		44,962,381
Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	352,692,115		344,105,550
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	671,752,929		593,979,239
Less allowance for estimated losses on loans/leases	(10,705,434)		(11,069,502)		(10,596,958)	(9,087,315)
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	128,901,442		103,685,656
Plus deferred loan/lease origination costs	4,814,183		3,907,140
Total Loans/Leases plus deferred loan/lease origination costs	133,715,625		107,592,796
Less allowance for estimated losses on loans/leases	(2,517,217)		(1,990,395)		(1,339,496)	(1,530,572)
Loans/leases net of allowance for estimated losses	131,198,408		105,602,401
* Direct financing leases:
Net minimum lease payments to be received	145,662,254		117,719,380
Estimated unguaranteed residual values of leased assets	1,694,499		1,095,848
Unearned lease/residual income	(18,455,311)		(15,129,572)
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	147,356,323	[1]	115,581,573	[1]
Less allowance for estimated losses on loans/leases	(1,395,849)		(1,070,328)		(704,946)	(748,028)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	76,033,810		76,720,514
Less allowance for estimated losses on loans/leases	$ (1,180,774)		$ (1,263,434)		$ (1,269,856)	$ (1,449,819)

[1] Includes residential real estate loans held for sale totaling $1,358,290 and $4,577,233 as of December 31, 2013 and 2012, respectively.