Note 7 - Troubled Debt Restructurings (Detail) - The Following Table Details Performing TDR Loans: (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Performing TDR loans accounted for on an accrual basis:
Percentage of total loans, net	1.20%	1.00%
Commercial Real Estate Loans [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	2,292	5,901
Commercial Construction [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis		29
Commercial Lots and Raw Land [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis		1,667
Commercial and Industrial [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	16	16
Consumer real estate [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	223	60
Consumer Lots and Raw Land [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	84	667
Consumer Other [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	24	26
Performing TDR Loans [Member]
Performing TDR loans accounted for on an accrual basis:
Performing TDR loans accrual basis	2,639	8,366
Percentage of total loans, net	0.60%	1.70%