Note 4 - Loans/Leases Receivable (Details) - Aging of the Loan/Lease Portfolio (USD $)	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,491,276,496	$ 1,257,131,874
30-59 Days Past Due	5,045,951	7,387,450
60-89 Days Past Due	2,731,184	1,599,934
Accruing Past Due 90 Days or More	3,248	159,481
Nonacrrual Loans/Loans	27,782,205	17,932,495
Total	1,526,839,084	1,284,211,234
Current as a percentage of total loan/lease portfolio	97.67%	97.89%
30-59 Days Past Due as a percentage of total loan/lease portfolio	0.33%	0.58%
60-89 Days Past Due as a percentage of total loan/lease portfolio	0.18%	0.12%
Accruing Past Due 90 Days or More as a percentage of total loan/lease portfolio	0.00%	0.01%
Nonacrrual Loans/Loans as a percentage of total loan/lease portfolio	1.82%	1.40%
Total as a percentage of total loan/lease portfolio	100.00%	100.00%
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	465,430,639	388,825,307
30-59 Days Past Due	1,349,678	3,724,506
60-89 Days Past Due	262,201	9,940
Accruing Past Due 90 Days or More		120,000
Nonacrrual Loans/Loans	3,373,838	1,564,499
Total	470,416,356	394,244,252
Owner-occupied commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	259,065,675	204,141,070
30-59 Days Past Due	193,040	142,993
60-89 Days Past Due	77,828	0
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	7,590,549	627,245
Total	266,927,092	204,911,308
Commercial construction, land development, and other land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	46,609,905	42,180,819
60-89 Days Past Due	270,796	0
Accruing Past Due 90 Days or More		0
Nonacrrual Loans/Loans	1,132,976	2,781,562
Total	48,013,677	44,962,381
Other commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	392,880,893	332,644,532
30-59 Days Past Due	1,851,491	86,986
60-89 Days Past Due	1,695,414	1,111,856
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	12,637,307	10,262,176
Total	409,065,105	344,105,550
Leases receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	112,797,068	101,635,084
30-59 Days Past Due	998,918	877,210
60-89 Days Past Due	258,197	174,560
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	700,574	998,802
Total	114,754,757	103,685,656
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	141,298,113	111,993,859
30-59 Days Past Due	369,329	2,254,730
60-89 Days Past Due	149,816	283,466
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	1,276,084	1,049,518
Total	143,093,342	115,581,573
Installment and Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	73,194,203	75,711,203
30-59 Days Past Due	283,495	301,025
60-89 Days Past Due	16,932	20,112
Accruing Past Due 90 Days or More	3,248	39,481
Nonacrrual Loans/Loans	1,070,877	648,693
Total	$ 74,568,755	$ 76,720,514