Note 3 - Loans/Leases Receivable (Detail) - Composition of the Loan/Lease Portfolio (USD $)	Sep. 30, 2012	Dec. 31, 2011
Loans and Leases	$ 1,244,292,209	$ 1,200,745,497
Total Loans/Leases plus deferred loan/lease origination costs	1,244,292,209	1,200,745,497
Loans/leases net of allowance for estimated losses	1,224,875,461	1,181,956,235
Commercial and Industrial [Member]
Loans and Leases	355,003,888	350,794,278
Owner-occupied commercial real estate [Member]
Loans and Leases	199,788,124	167,790,621
Commercial construction, land development, and other land [Member]
Loans and Leases	49,191,909	60,384,738
Other commercial real estate [Member]
Loans and Leases	345,923,717	349,628,491
Total Commercial [Member]
Loans and Leases	594,903,750	577,803,850
Leases receivable [Member]
Loans and Leases	102,038,868	93,212,362
Plus deferred loan/lease origination costs	3,727,752	3,217,011
Total Loans/Leases plus deferred loan/lease origination costs	105,766,620	96,429,373
Less allowance for estimated losses on loans/leases	(1,884,985)	(1,339,496)
Loans/leases net of allowance for estimated losses	103,881,635	95,089,877
* Direct financing leases:
Net minimum lease payments to be received	115,931,555	106,389,988
Estimated unguaranteed residual values of leased assets	1,111,627	1,043,326
Unearned lease/residual income	(15,004,314)	(14,220,952)
Mortgage Receivable [Member]
Loans and Leases	112,492,219	98,107,051
Loans Receivable [Member]
Loans and Leases	76,837,989	78,223,080
Total [Member]
Loans and Leases	1,241,276,714	1,198,140,621
Plus deferred loan/lease origination costs	3,015,495	2,604,876
Less allowance for estimated losses on loans/leases	$ (19,416,748)	$ (18,789,262)