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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Shareholders' equity:    
Common stock, par value $ 0 $ 0
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 20,400,085 20,338,461
Common stock, shares outstanding 20,400,085 20,338,461