Note 3 - Loans/Leases Receivable (Details) - Composition of the Loan/Lease Portfolio (USD $)	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	$ 1,566,665,364			$ 1,455,732,633
Plus deferred loan/lease origination costs	6,203,781			4,546,925
Total Loans/Leases plus deferred loan/lease origination costs	1,572,869,145			1,460,279,558
Less allowance for estimated losses on loans/leases	(22,767,917)		(23,067,024)	(21,448,048)		(22,062,389)	(21,156,379)	(19,925,204)
Loans/leases net of allowance for estimated losses	1,550,101,228			1,438,831,510
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	479,747,059			431,688,129
Less allowance for estimated losses on loans/leases	(6,914,058)		(6,549,378)	(5,648,774)		(5,367,524)	(4,790,828)	(4,531,545)
Owner-Occupied Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	251,076,360			261,215,912
Commercial Construction, Land Development, and Other Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	69,856,024			57,844,902
Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	376,795,649			352,692,115
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	697,728,033			671,752,929
Less allowance for estimated losses on loans/leases	(10,028,668)		(10,277,692)	(10,705,434)		(12,210,862)	(12,190,497)	(11,069,502)
Finance Leases Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net minimum lease payments to be received	184,475,603	[1]		145,662,254	[1]
Estimated unguaranteed residual values of leased assets	1,538,482	[1]		1,694,499	[1]
Unearned lease/residual income	(23,538,006)	[1]		(18,455,311)	[1]
Loans and Leases	162,476,079	[1]		128,901,442	[1]
Plus deferred loan/lease origination costs	6,339,575	[1]		4,814,183	[1]
Total Loans/Leases plus deferred loan/lease origination costs	168,815,654	[1]		133,715,625	[1]
Less allowance for estimated losses on loans/leases	(3,106,887)	[1]	(3,319,131)	(2,517,217)	[1]	(2,323,509)	(2,187,605)	(1,990,395)
Loans/leases net of allowance for estimated losses	165,708,767	[1]		131,198,408	[1]
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	154,954,020	[2]		147,356,323	[2]
Less allowance for estimated losses on loans/leases	(1,353,070)		(1,439,185)	(1,395,849)		(1,267,505)	(1,165,341)	(1,070,328)
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases	71,760,173			76,033,810
Less allowance for estimated losses on loans/leases	$ (1,365,234)		$ (1,481,638)	$ (1,180,774)		$ (892,989)	$ (822,108)	$ (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 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 for the three and nine months ended September 30, 2014 and 2013.

[2] Includes residential real estate loans held for sale totaling $1,642,300 and $1,358,290 as of September 30, 2014, and December 31, 2013, respectively.