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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Preferred stock, par $ 0.001 $ 0.001
Preferred stock, authorized 1,000,000 1,000,000
Preferred stock, issued      
Common stock, par $ 0.001 $ 0.001
Common stock, authorized 100,000,000 100,000,000
Common stock, outstanding 30,561,616 30,541,506
Treasury stock, shares 10,009,492 10,009,492