Note 4 - Stock Benefit Plans (Detail)	Mar. 31, 2013	Dec. 31, 2012
Number of Equity Incentive Plans	2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	65,000	65,000
In The Money [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,354
Service Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	85,906
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	16,532
2004 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,700,000
2006 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	400,000