Note 3 - Loans/Leases Receivable (Detail) - Loans By Credit Quality Indicators (USD $)	Mar. 31, 2013	Dec. 31, 2012
Internally Assigned Risk Rating	$ 996,755,858	$ 988,223,491
Pass [Member] | Commercial and Industrial [Member]
Internally Assigned Risk Rating	374,705,482	371,856,380
Pass [Member] | Owner-occupied commercial real estate [Member]
Internally Assigned Risk Rating	203,077,969	195,567,523
Pass [Member] | Commercial construction, land development, and other land [Member]
Internally Assigned Risk Rating	37,563,441	38,125,793
Pass [Member] | Non-owner occupied Commercial Real Estate [Member]
Internally Assigned Risk Rating	303,600,297	312,370,393
Pass [Member]
Internally Assigned Risk Rating	918,947,189	917,920,089
Special Mention [Member] | Commercial and Industrial [Member]
Internally Assigned Risk Rating	10,752,887	8,008,866
Special Mention [Member] | Owner-occupied commercial real estate [Member]
Internally Assigned Risk Rating	4,276,925	5,488,602
Special Mention [Member] | Commercial construction, land development, and other land [Member]
Internally Assigned Risk Rating	3,536,555	1,238,152
Special Mention [Member] | Non-owner occupied Commercial Real Estate [Member]
Internally Assigned Risk Rating	9,043,854	7,319,902
Special Mention [Member]
Internally Assigned Risk Rating	27,610,221	22,055,522
Substandard [Member] | Commercial and Industrial [Member]
Internally Assigned Risk Rating	12,663,871	14,379,006
Substandard [Member] | Owner-occupied commercial real estate [Member]
Internally Assigned Risk Rating	4,946,645	3,855,183
Substandard [Member] | Commercial construction, land development, and other land [Member]
Internally Assigned Risk Rating	5,349,164	5,598,436
Substandard [Member] | Non-owner occupied Commercial Real Estate [Member]
Internally Assigned Risk Rating	27,238,768	24,415,255
Substandard [Member]
Internally Assigned Risk Rating	50,198,448	48,247,880
Doubtful [Member] | Commercial and Industrial [Member]
Internally Assigned Risk Rating	0	0
Doubtful [Member] | Owner-occupied commercial real estate [Member]
Internally Assigned Risk Rating	0	0
Doubtful [Member] | Commercial construction, land development, and other land [Member]
Internally Assigned Risk Rating	0	0
Doubtful [Member] | Non-owner occupied Commercial Real Estate [Member]
Internally Assigned Risk Rating	0	0
Doubtful [Member]
Internally Assigned Risk Rating	0	0
Commercial and Industrial [Member]
Internally Assigned Risk Rating	398,122,240	394,244,252
Owner-occupied commercial real estate [Member]
Internally Assigned Risk Rating	212,301,539	204,911,308
Commercial construction, land development, and other land [Member]
Internally Assigned Risk Rating	46,449,160	44,962,381
Non-owner occupied Commercial Real Estate [Member]
Internally Assigned Risk Rating	$ 339,882,919	$ 344,105,550