BALANCE SHEETS (Parenthetical) (USD $)	Jun. 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	4,893,979	4,893,979
Common stock, outstanding shares	4,788,916	4,803,710
Common stock held in treasury	105,063	90,269