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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, Authorized 1,000,000 1,000,000
Preferred stock, issued      
Common stock, par value $ 0.001 $ 0.001
Common stock, Authorized 100,000,000 100,000,000
Common stock, outstanding 30,541,506 30,445,881
Treasury stock, shares 10,009,492 10,009,492