Note 3 - Loans/Leases Receivable (Detail) - Recorded Investment by Credit Quality Indicators, Commercial Real Estate (USD $)	Jun. 30, 2012	Dec. 31, 2011
Internally assigned risk rating	$ 1,194,579,266	$ 1,181,956,235
Commercial and Industrial [Member] | Pass [Member]
Internally assigned risk rating	326,648,303	324,225,905
Commercial and Industrial [Member] | Special Mention [Member]
Internally assigned risk rating	8,239,440	8,814,497
Commercial and Industrial [Member] | Substandard [Member]
Internally assigned risk rating	15,892,674	17,753,876
Commercial and Industrial [Member] | Doubtful [Member]
Internally assigned risk rating	0	0
Commercial and Industrial [Member] | Total [Member]
Internally assigned risk rating	350,780,417	350,794,278
Owner-occupied commercial real estate [Member] | Pass [Member]
Internally assigned risk rating	183,382,668	158,955,618
Owner-occupied commercial real estate [Member] | Special Mention [Member]
Internally assigned risk rating	3,609,328	2,700,496
Owner-occupied commercial real estate [Member] | Substandard [Member]
Internally assigned risk rating	1,956,751	6,134,507
Owner-occupied commercial real estate [Member] | Doubtful [Member]
Internally assigned risk rating	0	0
Owner-occupied commercial real estate [Member] | Total [Member]
Internally assigned risk rating	188,948,747	167,790,621
Commercial construction, land development, and other land [Member] | Pass [Member]
Internally assigned risk rating	40,298,069	46,268,554
Commercial construction, land development, and other land [Member] | Special Mention [Member]
Internally assigned risk rating	442,149	764,586
Commercial construction, land development, and other land [Member] | Substandard [Member]
Internally assigned risk rating	5,923,515	13,351,598
Commercial construction, land development, and other land [Member] | Doubtful [Member]
Internally assigned risk rating	0	0
Commercial construction, land development, and other land [Member] | Total [Member]
Internally assigned risk rating	46,663,733	60,384,738
Non-owner occupied Commercial Real Estate [Member] | Pass [Member]
Internally assigned risk rating	303,371,664	310,401,972
Non-owner occupied Commercial Real Estate [Member] | Special Mention [Member]
Internally assigned risk rating	9,046,514	13,754,798
Non-owner occupied Commercial Real Estate [Member] | Substandard [Member]
Internally assigned risk rating	28,256,640	25,471,721
Non-owner occupied Commercial Real Estate [Member] | Doubtful [Member]
Internally assigned risk rating	0	0
Non-owner occupied Commercial Real Estate [Member] | Total [Member]
Internally assigned risk rating	340,674,818	349,628,491
Total [Member] | Pass [Member]
Internally assigned risk rating	853,700,704	839,852,049
Total [Member] | Special Mention [Member]
Internally assigned risk rating	21,337,431	26,034,377
Total [Member] | Substandard [Member]
Internally assigned risk rating	52,029,580	62,711,702
Total [Member] | Doubtful [Member]
Internally assigned risk rating	0	0
Total [Member] | Total [Member]
Internally assigned risk rating	$ 927,067,715	$ 928,598,128