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BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Balance Sheets    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 11,777,000 12,216,000
Common stock, shares outstanding 11,687,000 12,191,000