Note 3 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 1,487,332,496		$ 1,455,732,633
Plus deferred loan/lease origination costs	5,247,046		4,546,925
Total Loans/Leases plus deferred loan/lease origination costs	1,492,579,542		1,460,279,558
Less allowance for estimated losses on loans/leases	(22,653,270)		(21,448,048)		(20,769,462)	(19,925,204)
Loans/leases net of allowance for estimated losses	1,469,926,272		1,438,831,510
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	442,350,475		431,688,129
Less allowance for estimated losses on loans/leases	(6,647,658)		(5,648,774)		(4,466,264)	(4,531,545)
Owner-Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	269,483,524		261,215,912
Commercial Construction, Land Development, and Other Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	55,194,025		57,844,902
Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	354,550,656		352,692,115
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	679,228,205		671,752,929
Less allowance for estimated losses on loans/leases	(10,587,657)		(10,705,434)		(12,188,953)	(11,069,502)
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net minimum lease payments to be received	158,423,507		145,662,254
Estimated unguaranteed residual values of leased assets	1,611,999		1,694,499
Unearned lease/residual income	(20,041,447)		(18,455,311)
Loans and Leases	139,994,059		128,901,442
Plus deferred loan/lease origination costs	5,347,779		4,814,183
Total Loans/Leases plus deferred loan/lease origination costs	145,341,838		133,715,625
Less allowance for estimated losses on loans/leases	(2,820,239)		(2,517,217)		(2,296,523)	(1,990,395)
Loans/leases net of allowance for estimated losses	142,521,599		131,198,408
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	148,950,217	[1]	147,356,323	[1]
Less allowance for estimated losses on loans/leases	(1,388,885)		(1,395,849)		(966,336)	(1,070,328)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	76,809,540		76,033,810
Less allowance for estimated losses on loans/leases	$ (1,208,831)		$ (1,180,774)		$ (851,386)	$ (1,263,434)

[1] Includes residential real estate loans held for sale totaling $291,600 and $1,358,290 as of March 31, 2014, and December 31, 2013, respectively.