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Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Balance Sheets [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 13,630,000 15,847,000
Common stock, shares outstanding 13,630,000 15,847,000