Note 3 - Loans/Leases Receivable (Detail) - Additional Information on Impaired Loans (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	$ 2,565,810	$ 4,372,125	$ 7,242,498
Impaired loans with no related allowance unpaid principal balance	2,938,193	5,320,511	7,889,489
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	15,779,852	19,922,086	21,638,337
Impaired loans with related allowance unpaid principal balance	16,085,745	20,197,297	22,488,337
Impaired loans related allowance	4,543,756	4,587,769	4,406,108
Total Impaired Loans/Leases:
Impaired loans recorded investment	18,345,662	24,294,211	28,880,835
Impaired loans unpaid principal balance	19,023,938	25,517,808	30,377,826
Impaired loans related allowance	4,543,756	4,587,769	4,406,108
Commercial and Industrial [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	402,621	438,355	358,028
Impaired loans with no related allowance unpaid principal balance	775,004	1,203,710	1,005,019
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	211,400	568,597	1,441,155
Impaired loans with related allowance unpaid principal balance	264,334	590,849	1,791,155
Impaired loans related allowance	498,260	280,170	371,974
Total Impaired Loans/Leases:
Impaired loans recorded investment	614,021	1,006,952	1,799,183
Impaired loans unpaid principal balance	1,039,338	1,794,559	2,796,174
Impaired loans related allowance	498,260	280,170	371,974
Owner-occupied commercial real estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	498,946	503,321	581,747
Impaired loans with no related allowance unpaid principal balance	498,946	503,321	581,747
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	0		199,427
Impaired loans with related allowance unpaid principal balance	0		199,427
Impaired loans related allowance	0		30,279
Total Impaired Loans/Leases:
Impaired loans recorded investment	498,946	503,321	781,174
Impaired loans unpaid principal balance	498,946	503,321	781,174
Impaired loans related allowance	0		30,279
Commercial construction, land development, and other land [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	0	678,523	337,500
Impaired loans with no related allowance unpaid principal balance	0	678,523	337,500
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	3,929,839	3,967,583	7,941,358
Impaired loans with related allowance unpaid principal balance	3,929,839	3,967,583	7,941,358
Impaired loans related allowance	1,154,155	1,105,795	2,166,666
Total Impaired Loans/Leases:
Impaired loans recorded investment	3,929,839	4,646,106	8,278,858
Impaired loans unpaid principal balance	3,929,839	4,646,106	8,278,858
Impaired loans related allowance	1,154,155	1,105,795	2,166,666
Other commercial real estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	47,958	495,702	3,735,092
Impaired loans with no related allowance unpaid principal balance	47,958	495,702	3,735,092
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	9,983,944	14,738,717	11,451,204
Impaired loans with related allowance unpaid principal balance	10,236,903	14,991,676	11,951,204
Impaired loans related allowance	2,353,684	2,899,247	1,627,176
Total Impaired Loans/Leases:
Impaired loans recorded investment	10,031,902	15,234,419	15,186,296
Impaired loans unpaid principal balance	10,284,861	15,487,378	15,686,296
Impaired loans related allowance	2,353,684	2,899,247	1,627,176
Leases receivable [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	789,346	777,645	602,456
Impaired loans with no related allowance unpaid principal balance	789,346	777,645	602,456
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	421,590	221,157	118,275
Impaired loans with related allowance unpaid principal balance	421,590	221,157	118,275
Impaired loans related allowance	325,294	125,000	35,000
Total Impaired Loans/Leases:
Impaired loans recorded investment	1,210,936	998,802	720,731
Impaired loans unpaid principal balance	1,210,936	998,802	720,731
Impaired loans related allowance	325,294	125,000	35,000
Residential Real Estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	630,324	944,211	676,244
Impaired loans with no related allowance unpaid principal balance	630,324	1,127,242	676,244
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	305,612	273,045	467,007
Impaired loans with related allowance unpaid principal balance	305,612	273,045	467,007
Impaired loans related allowance	95,232	105,565	155,102
Total Impaired Loans/Leases:
Impaired loans recorded investment	935,936	1,217,256	1,143,251
Impaired loans unpaid principal balance	935,936	1,400,287	1,143,251
Impaired loans related allowance	95,232	105,565	155,102
Installment and Other Consumer [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	196,615	534,368	951,431
Impaired loans with no related allowance unpaid principal balance	196,615	534,368	951,431
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	927,467	152,987	19,911
Impaired loans with related allowance unpaid principal balance	927,467	152,987	19,911
Impaired loans related allowance	117,131	71,992	19,911
Total Impaired Loans/Leases:
Impaired loans recorded investment	1,124,082	687,355	971,342
Impaired loans unpaid principal balance	1,124,082	687,355	971,342
Impaired loans related allowance	$ 117,131	$ 71,992	$ 19,911