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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Common stock, no par value      
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 20,020,535 20,338,461
Common stock, shares outstanding 20,020,535 20,338,461