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BALANCE SHEETS (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
SHAREHOLDERS' EQUITY    
Common stock, par value $ 0 $ 0
Common stock, authorized shares 10,000,000 10,000,000
Common stock, issued shares 4,921,979 4,893,979
Common stock, outstanding shares 4,808,561 4,803,710
Common stock held in treasury 113,418 90,269