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BALANCE SHEETS [PARENTHETICAL] (USD $)
Jun. 30, 2012
Dec. 31, 2011
Allowance for doubtful accounts (in dollars) $ 14,000 $ 16,000
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 8,000,000 8,000,000
Common stock, shares issued 3,261,148 3,261,148
Treasury stock, shares 242,114 257,114