Note 4 - Loans/Leases Receivable (Details) - Loans By Credit Quality Indicators (USD $)	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	$ 1,185,958,027	$ 988,223,491
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	445,104,945	371,856,380
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	11,374,381	8,008,866
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	14,733,895	14,379,006
Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	43,753	0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	471,256,974	394,244,252
Owner-occupied commercial real estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	249,985,030	195,567,523
Owner-occupied commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	3,261,364	5,488,602
Owner-occupied commercial real estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	6,095,333	3,855,183
Owner-occupied commercial real estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	158,726	0
Owner-occupied commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	259,500,453	204,911,308
Commercial construction, land development, and other land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	36,776,727	38,125,793
Commercial construction, land development, and other land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	5,292,606	1,238,152
Commercial construction, land development, and other land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	7,515,739	5,598,436
Commercial construction, land development, and other land [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	0	0
Commercial construction, land development, and other land [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	49,585,072	44,962,381
Non-owner occupied Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	374,036,916	312,370,393
Non-owner occupied Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	9,717,356	7,319,902
Non-owner occupied Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	21,861,256	24,415,255
Non-owner occupied Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	0	0
Non-owner occupied Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	405,615,528	344,105,550
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	1,105,903,618	917,920,089
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	29,645,707	22,055,522
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	50,206,223	48,247,880
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	$ 202,479	$ 0