Note 4 - Loans/Leases Receivable (Details) - Aging of the Loan/Lease Portfolio (USD $)	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,506,139,221	$ 1,257,131,874
30-59 Days Past Due	5,432,324	7,387,450
60-89 Days Past Due	1,518,647	1,599,934
Accruing Past Due 90 Days or More	60,914	159,481
Nonacrrual Loans/Loans	22,126,437	17,932,495
Total	1,535,277,543	1,284,211,234
Current as a percentage of total loan/lease portfolio	98.10%	97.89%
30-59 Days Past Due as a percentage of total loan/lease portfolio	0.35%	0.58%
60-89 Days Past Due as a percentage of total loan/lease portfolio	0.10%	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	1.44%	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	466,597,618	388,825,307
30-59 Days Past Due	1,493,016	3,724,506
60-89 Days Past Due	208,603	9,940
Accruing Past Due 90 Days or More		120,000
Nonacrrual Loans/Loans	2,957,737	1,564,499
Total	471,256,974	394,244,252
Owner-occupied commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	257,258,899	204,141,070
30-59 Days Past Due	41,296	142,993
60-89 Days Past Due	58,933	0
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	2,141,325	627,245
Total	259,500,453	204,911,308
Commercial construction, land development, and other land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	46,919,007	42,180,819
30-59 Days Past Due	1,506,409
60-89 Days Past Due	509,601	0
Accruing Past Due 90 Days or More	59,975	0
Nonacrrual Loans/Loans	590,080	2,781,562
Total	49,585,072	44,962,381
Other commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	391,773,134	332,644,532
30-59 Days Past Due	515,680	86,986
60-89 Days Past Due	346,985	1,111,856
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	12,979,729	10,262,176
Total	405,615,528	344,105,550
Leases receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	118,820,384	101,635,084
30-59 Days Past Due	1,429,405	877,210
60-89 Days Past Due	319,620	174,560
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	698,588	998,802
Total	121,267,997	103,685,656
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	148,740,223	111,993,859
30-59 Days Past Due	346,108	2,254,730
60-89 Days Past Due	52,029	283,466
Accruing Past Due 90 Days or More	0	0
Nonacrrual Loans/Loans	1,686,796	1,049,518
Total	150,825,156	115,581,573
Installment and Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	76,029,956	75,711,203
30-59 Days Past Due	100,410	301,025
60-89 Days Past Due	22,876	20,112
Accruing Past Due 90 Days or More	939	39,481
Nonacrrual Loans/Loans	1,072,182	648,693
Total	$ 77,226,363	$ 76,720,514