Note 3 - Loans/Leases Receivable (Detail) - Impaired Loans/Leases (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	$ 2,565,810	$ 7,242,498	$ 4,372,125
Impaired loans with no related allowance unpaid principal balance	2,938,193	7,889,489	5,320,511
Impaired loans with no related allowance average recorded investment	6,303,847	8,201,145
Impaired loans with no related allowance interest income recognized	44,133	4,758
Impaired loans with no related allowance interest income recognized for cash payments received	44,133	4,758
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	15,779,852	21,638,337	19,922,086
Impaired loans with related allowance unpaid principal balance	16,085,745	22,488,337	20,197,297
Impaired loans with related allowance related allowance	4,543,756	4,406,108	4,587,769
Impaired loans with related allowance average recorded investment	15,407,993	21,730,805
Impaired loans with related allowance interest income recognized	7,537	69,531
Impaired loans with related allowance interest income recognized for cash payments received	7,537	69,531
Total Impaired Loans/Leases:
Impaired loans recorded investment	18,345,662	28,880,835	24,294,211
Impaired loans unpaid principal balance	19,023,938	30,377,826	25,517,808
Impaired loans related allowance	4,543,756	4,406,108	4,587,769
Impaired loans average recorded investment	21,711,840	29,931,950
Impaired loans interest income recognized	51,670	74,289
Impaired loans interest income recognized for cash payments received	51,670	74,289
Commercial and Industrial [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	402,621	358,028	438,355
Impaired loans with no related allowance unpaid principal balance	775,004	1,005,019	1,203,710
Impaired loans with no related allowance average recorded investment	767,929	396,127
Impaired loans with no related allowance interest income recognized	1,924	0
Impaired loans with no related allowance interest income recognized for cash payments received	1,924	0
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	211,400	1,441,155	568,597
Impaired loans with related allowance unpaid principal balance	264,334	1,791,155	590,849
Impaired loans with related allowance related allowance	498,260	371,974	280,170
Impaired loans with related allowance average recorded investment	216,133	1,648,384
Impaired loans with related allowance interest income recognized	0	1,980
Impaired loans with related allowance interest income recognized for cash payments received	0	1,980
Total Impaired Loans/Leases:
Impaired loans recorded investment	614,021	1,799,183	1,006,952
Impaired loans unpaid principal balance	1,039,338	2,796,174	1,794,559
Impaired loans related allowance	498,260	371,974	280,170
Impaired loans average recorded investment	984,062	2,044,511
Impaired loans interest income recognized	1,924	1,980
Impaired loans interest income recognized for cash payments received	1,924	1,980
Owner-occupied commercial real estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	498,946	581,747	503,321
Impaired loans with no related allowance unpaid principal balance	498,946	581,747	503,321
Impaired loans with no related allowance average recorded investment	507,451	637,245
Impaired loans with no related allowance interest income recognized	0	0
Impaired loans with no related allowance interest income recognized for cash payments received	0	0
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 with related allowance related allowance	0	30,279
Impaired loans with related allowance average recorded investment	0	199,427
Impaired loans with related allowance interest income recognized	0	0
Impaired loans with related allowance interest income recognized for cash payments received	0	0
Total Impaired Loans/Leases:
Impaired loans recorded investment	498,946	781,174	503,321
Impaired loans unpaid principal balance	498,946	781,174	503,321
Impaired loans related allowance	0	30,279
Impaired loans average recorded investment	507,451	836,672
Impaired loans interest income recognized	0	0
Impaired loans interest income recognized for cash payments received	0	0
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	337,500	678,523
Impaired loans with no related allowance unpaid principal balance	0	337,500	678,523
Impaired loans with no related allowance average recorded investment	0	112,500
Impaired loans with no related allowance interest income recognized	0	2,168
Impaired loans with no related allowance interest income recognized for cash payments received	0	2,168
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	3,929,839	7,941,358	3,967,583
Impaired loans with related allowance unpaid principal balance	3,929,839	7,941,358	3,967,583
Impaired loans with related allowance related allowance	1,154,155	2,166,666	1,105,795
Impaired loans with related allowance average recorded investment	3,933,530	7,891,719
Impaired loans with related allowance interest income recognized	2,703	0
Impaired loans with related allowance interest income recognized for cash payments received	2,703	0
Total Impaired Loans/Leases:
Impaired loans recorded investment	3,929,839	8,278,858	4,646,106
Impaired loans unpaid principal balance	3,929,839	8,278,858	4,646,106
Impaired loans related allowance	1,154,155	2,166,666	1,105,795
Impaired loans average recorded investment	3,933,530	8,004,219
Impaired loans interest income recognized	2,703	2,168
Impaired loans interest income recognized for cash payments received	2,703	2,168
Other commercial real estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	47,958	3,735,092	495,702
Impaired loans with no related allowance unpaid principal balance	47,958	3,735,092	495,702
Impaired loans with no related allowance average recorded investment	3,198,617	4,367,673
Impaired loans with no related allowance interest income recognized	40,116	894
Impaired loans with no related allowance interest income recognized for cash payments received	40,116	894
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	9,983,944	11,451,204	14,738,717
Impaired loans with related allowance unpaid principal balance	10,236,903	11,951,204	14,991,676
Impaired loans with related allowance related allowance	2,353,684	1,627,176	2,899,247
Impaired loans with related allowance average recorded investment	10,046,487	11,496,658
Impaired loans with related allowance interest income recognized	4,501	67,551
Impaired loans with related allowance interest income recognized for cash payments received	4,501	67,551
Total Impaired Loans/Leases:
Impaired loans recorded investment	10,031,902	15,186,296	15,234,419
Impaired loans unpaid principal balance	10,284,861	15,686,296	15,487,378
Impaired loans related allowance	2,353,684	1,627,176	2,899,247
Impaired loans average recorded investment	13,245,104	15,864,331
Impaired loans interest income recognized	44,617	68,445
Impaired loans interest income recognized for cash payments received	44,617	68,445
Leases receivable [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	789,346	602,456	777,645
Impaired loans with no related allowance unpaid principal balance	789,346	602,456	777,645
Impaired loans with no related allowance average recorded investment	831,677	922,197
Impaired loans with no related allowance interest income recognized	0	0
Impaired loans with no related allowance interest income recognized for cash payments received	0	0
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	421,590	118,275	221,157
Impaired loans with related allowance unpaid principal balance	421,590	118,275	221,157
Impaired loans with related allowance related allowance	325,294	35,000	125,000
Impaired loans with related allowance average recorded investment	273,192	91,501
Impaired loans with related allowance interest income recognized	0	0
Impaired loans with related allowance interest income recognized for cash payments received	0	0
Total Impaired Loans/Leases:
Impaired loans recorded investment	1,210,936	720,731	998,802
Impaired loans unpaid principal balance	1,210,936	720,731	998,802
Impaired loans related allowance	325,294	35,000	125,000
Impaired loans average recorded investment	1,104,869	1,013,698
Impaired loans interest income recognized	0	0
Impaired loans interest income recognized for cash payments received	0	0
Residential Real Estate [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	630,324	676,244	944,211
Impaired loans with no related allowance unpaid principal balance	630,324	676,244	1,127,242
Impaired loans with no related allowance average recorded investment	810,583	815,292
Impaired loans with no related allowance interest income recognized	0	1,673
Impaired loans with no related allowance interest income recognized for cash payments received	0	1,673
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	305,612	467,007	273,045
Impaired loans with related allowance unpaid principal balance	305,612	467,007	273,045
Impaired loans with related allowance related allowance	95,232	155,102	105,565
Impaired loans with related allowance average recorded investment	308,841	383,095
Impaired loans with related allowance interest income recognized	0	0
Impaired loans with related allowance interest income recognized for cash payments received	0	0
Total Impaired Loans/Leases:
Impaired loans recorded investment	935,936	1,143,251	1,217,256
Impaired loans unpaid principal balance	935,936	1,143,251	1,400,287
Impaired loans related allowance	95,232	155,102	105,565
Impaired loans average recorded investment	1,119,424	1,198,387
Impaired loans interest income recognized	0	1,673
Impaired loans interest income recognized for cash payments received	0	1,673
Installment and Other Consumer [Member]
Impaired Loans/Leases with No Specific Allowance Recorded:
Impaired loans with no related allowance recorded investment	196,615	951,431	534,368
Impaired loans with no related allowance unpaid principal balance	196,615	951,431	534,368
Impaired loans with no related allowance average recorded investment	187,590	950,111
Impaired loans with no related allowance interest income recognized	2,093	23
Impaired loans with no related allowance interest income recognized for cash payments received	2,093	23
Impaired Loans/Leases with Specific Allowance Recorded:
Impaired loans with related allowance recorded investment	927,467	19,911	152,987
Impaired loans with related allowance unpaid principal balance	927,467	19,911	152,987
Impaired loans with related allowance related allowance	117,131	19,911	71,992
Impaired loans with related allowance average recorded investment	629,810	20,021
Impaired loans with related allowance interest income recognized	333	0
Impaired loans with related allowance interest income recognized for cash payments received	333	0
Total Impaired Loans/Leases:
Impaired loans recorded investment	1,124,082	971,342	687,355
Impaired loans unpaid principal balance	1,124,082	971,342	687,355
Impaired loans related allowance	117,131	19,911	71,992
Impaired loans average recorded investment	817,400	970,132
Impaired loans interest income recognized	2,426	23
Impaired loans interest income recognized for cash payments received	$ 2,426	$ 23