Note 4 - Loans/Leases Receivable (Details) - Loans By Credit Quality Indicators (USD $)	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	$ 1,194,422,230	$ 988,223,491
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	444,731,963	371,856,380
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	10,507,646	8,008,866
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	15,176,747	14,379,006
Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	0	0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	470,416,356	394,244,252
Owner-occupied commercial real estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	254,134,556	195,567,523
Owner-occupied commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	3,349,849	5,488,602
Owner-occupied commercial real estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	9,442,687	3,855,183
Owner-occupied commercial real estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	0	0
Owner-occupied commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	266,927,092	204,911,308
Commercial construction, land development, and other land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	34,521,499	38,125,793
Commercial construction, land development, and other land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	6,843,887	1,238,152
Commercial construction, land development, and other land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	6,648,291	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	48,013,677	44,962,381
Non-owner occupied Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	374,410,742	312,370,393
Non-owner occupied Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	8,026,958	7,319,902
Non-owner occupied Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	26,627,405	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	409,065,105	344,105,550
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	1,107,798,760	917,920,089
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	28,728,340	22,055,522
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	57,895,130	48,247,880
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally Assigned Risk Rating	$ 0	$ 0