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BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
SHAREHOLDERS' EQUITY    
Common stock, par value $ 0 $ 0
Common stock, authorized shares 10,000,000 10,000,000
Common stock, issued shares 5,099,177 4,983,206
Common stock, outstanding shares 4,949,278 4,869,788
Common stock held in treasury 149,899 113,418