Note 3 - Loans/Leases Receivable (Detail) - Troubled Debt Restructurings (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Troubled Debt Restructurings Specific Allowance	$ 4,543,756	$ 4,587,769	$ 4,406,108
Significant Payment Delay [Member] | Owner-occupied commercial real estate [Member]
Troubled Debt Restructurings Number of Loans/Leases	1
Troubled Debt Restructurings Pre-Modification Recorded Investment	47,958
Troubled Debt Restructurings Post-Modification Recorded Investment	47,958
Significant Payment Delay [Member] | Commercial construction, land development, and other land [Member]
Troubled Debt Restructurings Number of Loans/Leases			2
Troubled Debt Restructurings Pre-Modification Recorded Investment			200,000
Troubled Debt Restructurings Post-Modification Recorded Investment			200,000
Troubled Debt Restructurings Specific Allowance			144,000
Significant Payment Delay [Member]
Troubled Debt Restructurings Number of Loans/Leases	1		2
Troubled Debt Restructurings Pre-Modification Recorded Investment	47,958		200,000
Troubled Debt Restructurings Post-Modification Recorded Investment	47,958		200,000
Troubled Debt Restructurings Specific Allowance			144,000
Extension of Maturity [Member] | Commercial and Industrial [Member]
Troubled Debt Restructurings Number of Loans/Leases	3
Troubled Debt Restructurings Pre-Modification Recorded Investment	809,494
Troubled Debt Restructurings Post-Modification Recorded Investment	809,494
Troubled Debt Restructurings Specific Allowance	188,700
Extension of Maturity [Member]
Troubled Debt Restructurings Number of Loans/Leases	3
Troubled Debt Restructurings Pre-Modification Recorded Investment	809,494
Troubled Debt Restructurings Post-Modification Recorded Investment	809,494
Troubled Debt Restructurings Specific Allowance	188,700
Interest Rate Adjusted Below Market [Member] | Commercial construction, land development, and other land [Member]
Troubled Debt Restructurings Number of Loans/Leases			1
Troubled Debt Restructurings Pre-Modification Recorded Investment			337,500
Troubled Debt Restructurings Post-Modification Recorded Investment			337,500
Interest Rate Adjusted Below Market [Member] | Residential Real Estate [Member]
Troubled Debt Restructurings Number of Loans/Leases			1
Troubled Debt Restructurings Pre-Modification Recorded Investment			167,739
Troubled Debt Restructurings Post-Modification Recorded Investment			167,739
Interest Rate Adjusted Below Market [Member] | Installment and Other Consumer [Member]
Troubled Debt Restructurings Number of Loans/Leases			1
Troubled Debt Restructurings Pre-Modification Recorded Investment			16,043
Troubled Debt Restructurings Post-Modification Recorded Investment			16,043
Interest Rate Adjusted Below Market [Member]
Troubled Debt Restructurings Number of Loans/Leases			3
Troubled Debt Restructurings Pre-Modification Recorded Investment			521,282
Troubled Debt Restructurings Post-Modification Recorded Investment			521,282
Owner-occupied commercial real estate [Member]
Troubled Debt Restructurings Specific Allowance	0		30,279
Commercial construction, land development, and other land [Member]
Troubled Debt Restructurings Specific Allowance	1,154,155	1,105,795	2,166,666
Commercial and Industrial [Member]
Troubled Debt Restructurings Specific Allowance	498,260	280,170	371,974
Residential Real Estate [Member]
Troubled Debt Restructurings Specific Allowance	95,232	105,565	155,102
Installment and Other Consumer [Member]
Troubled Debt Restructurings Specific Allowance	117,131	71,992	19,911
Troubled Debt Restructurings [Member]
Troubled Debt Restructurings Number of Loans/Leases	4		5
Troubled Debt Restructurings Pre-Modification Recorded Investment	857,452		721,282
Troubled Debt Restructurings Post-Modification Recorded Investment	857,452		721,282
Troubled Debt Restructurings Specific Allowance	$ 188,700		$ 144,000