Note 3 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio (USD $)	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 1,543,517,198			$ 1,455,732,633
Plus deferred loan/lease origination costs	5,850,551			4,546,925
Total Loans/Leases plus deferred loan/lease origination costs	1,549,367,749			1,460,279,558
Less allowance for estimated losses on loans/leases	(23,067,024)		(22,653,270)	(21,448,048)		(21,156,379)	(20,769,462)	(19,925,204)
Loans/leases net of allowance for estimated losses	1,526,300,725			1,438,831,510
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	480,494,321			431,688,129
Less allowance for estimated losses on loans/leases	(6,549,378)		(6,647,658)	(5,648,774)		(4,790,828)	(4,466,264)	(4,531,545)
Owner-Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	247,596,151			261,215,912
Commercial Construction, Land Development, and Other Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	58,042,089			57,844,902
Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	377,737,501			352,692,115
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	683,375,741			671,752,929
Less allowance for estimated losses on loans/leases	(10,277,692)		(10,587,657)	(10,705,434)		(12,190,497)	(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	175,772,051			145,662,254
Estimated unguaranteed residual values of leased assets	1,642,309			1,694,499
Unearned lease/residual income	(22,410,342)			(18,455,311)
Loans and Leases	155,004,018			128,901,442
Plus deferred loan/lease origination costs	5,935,700			4,814,183
Total Loans/Leases plus deferred loan/lease origination costs	160,939,718			133,715,625
Less allowance for estimated losses on loans/leases	(3,319,131)		(2,820,239)	(2,517,217)		(2,187,605)	(2,296,523)	(1,990,395)
Loans/leases net of allowance for estimated losses	157,620,587			131,198,408
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	153,199,719	[1]		147,356,323	[1]
Less allowance for estimated losses on loans/leases	(1,439,185)		(1,388,885)	(1,395,849)		(1,165,341)	(966,336)	(1,070,328)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	71,443,399			76,033,810
Less allowance for estimated losses on loans/leases	$ (1,481,638)		$ (1,208,831)	$ (1,180,774)		$ (822,108)	$ (851,386)	$ (1,263,434)

[1] Includes residential real estate loans held for sale totaling $1,302,175 and $1,358,290 as of June 30, 2014, and December 31, 2013, respectively.