Note 5 - Loans Held for Investment (Detail) - Past Due Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Residential Real Estate Loans [Member]
30-59 Days Past Due	$ 3,440	$ 3,080
60-89 Days Past Due	675	1,205
Over 90 Days Past Due	684	593
Total Past Due	4,799	4,878
Current	66,784	67,627
Total Financing Receivables	71,583	72,505
Over 90 Days and Accruing	216	593
Residential Construction [Member]
30-59 Days Past Due	145
Total Past Due	145
Current	2,070	2,834
Total Financing Receivables	2,215	2,834
Residential Lots and Raw Land [Member]
30-59 Days Past Due	19	14
Total Past Due	19	14
Current	910	871
Total Financing Receivables	929	885
Commercial Real Estate Loans [Member]
30-59 Days Past Due	1,699	2,806
60-89 Days Past Due	1,648	763
Over 90 Days Past Due	631	2,492
Total Past Due	3,978	6,061
Current	207,988	210,557
Total Financing Receivables	211,966	216,618
Over 90 Days and Accruing		53
Commercial Real Estate Construction Financing Receivable [Member]
Current	22,562	20,495
Total Financing Receivables	22,562	20,495
Commercial Lots and Raw Land [Member]
30-59 Days Past Due	1,963	1,251
60-89 Days Past Due	67	1,655
Over 90 Days Past Due	1,018	964
Total Past Due	3,048	3,870
Current	29,781	30,915
Total Financing Receivables	32,829	34,785
Commercial and Industrial [Member]
30-59 Days Past Due	44	196
60-89 Days Past Due		29
Over 90 Days Past Due	10	19
Total Past Due	54	244
Current	21,739	20,524
Total Financing Receivables	21,793	20,768
Finance Leases Financing Receivable [Member]
30-59 Days Past Due		17
60-89 Days Past Due	0
Over 90 Days Past Due		186
Total Past Due		203
Current	5,924	5,509
Total Financing Receivables	5,924	5,712
Over 90 Days and Accruing		203
Consumer real estate [Member]
30-59 Days Past Due	172	352
60-89 Days Past Due	248	400
Over 90 Days Past Due	76	31
Total Past Due	496	783
Current	18,924	18,567
Total Financing Receivables	19,420	19,350
Over 90 Days and Accruing		31
Consumer Construction [Member]
Current	943	681
Total Financing Receivables	943	681
Consumer Lots and Raw Land [Member]
30-59 Days Past Due	45	73
60-89 Days Past Due	204
Over 90 Days Past Due	151
Total Past Due	400	73
Current	16,548	17,176
Total Financing Receivables	16,948	17,249
Home equity lines of credit [Member]
30-59 Days Past Due	218	190
60-89 Days Past Due	60	19
Over 90 Days Past Due	21	15
Total Past Due	299	224
Current	25,770	26,430
Total Financing Receivables	26,069	26,654
Over 90 Days and Accruing	21
Consumer Other [Member]
30-59 Days Past Due	29	13
60-89 Days Past Due	1
Over 90 Days Past Due	1
Total Past Due	31	13
Current	4,306	4,334
Total Financing Receivables	4,337	4,347
Total [Member]
30-59 Days Past Due	7,774	7,992
60-89 Days Past Due	2,903	4,071
Over 90 Days Past Due	2,592	4,300
Total Past Due	13,269	16,363
Current	424,249	426,520
Total Financing Receivables	437,518	442,883
Over 90 Days and Accruing	$ 237	$ 880