CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts	$ 145,000	$ 145,000
STOCKHOLDERS' EQUITY
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized (in shares)	10,000,000	10,000,000
Common stock, issued (in shares)	5,102,000	5,101,000
Common stock, outstanding (in shares)	4,733,000	4,732,000
Treasury stock (in shares)	369,000	369,000