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Note 2 - Stock-Based Compensation (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 61,132 79,693 88,774 88,774
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) $ 0   $ 0  
Unvested Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0   9,000