Note 3 - Loans/Leases Receivable (Detail) - Composition of the Loan/Lease Portfolio (USD $)	Jun. 30, 2012	Dec. 31, 2011
Loans and Leases	$ 1,213,303,801	$ 1,200,745,497
Total Loans/Leases plus deferred loan/lease origination costs	1,213,303,801	1,200,745,497
Loans/leases net of allowance for estimated losses	1,194,579,266	1,181,956,235
Commercial and Industrial [Member]
Loans and Leases	350,780,417	350,794,278
Owner-occupied commercial real estate [Member]
Loans and Leases	188,948,747	167,790,621
Commercial construction, land development, and other land [Member]
Loans and Leases	46,663,733	60,384,738
Other commercial real estate [Member]
Loans and Leases	340,674,818	349,628,491
Total Commerical [Member]
Loans and Leases	576,287,298	577,803,850
Leases receivable [Member]
Loans and Leases	98,567,582	93,212,362
Plus deferred loan/lease origination costs	3,519,830	3,217,011
Total Loans/Leases plus deferred loan/lease origination costs	102,087,412	96,429,373
Less allowance for estimated losses on loans/leases	(1,610,999)	(1,339,496)
Loans/leases net of allowance for estimated losses	100,476,413	95,089,877
* Direct financing leases:
Net minimum lease payments to be received	112,122,885	106,389,988
Estimated unguaranteed residual values of leased assets	1,144,745	1,043,326
Unearned lease/residual income	(14,700,048)	(14,220,952)
Mortgage Receivable [Member]
Loans and Leases	107,450,497	98,107,051
Loans Receivable [Member]
Loans and Leases	77,416,813	78,223,080
Total [Member]
Loans and Leases	1,210,502,607	1,198,140,621
Plus deferred loan/lease origination costs	2,801,194	2,604,876
Less allowance for estimated losses on loans/leases	$ (18,724,535)	$ (18,789,262)