CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Accounts receivables, 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	5,103,000
Common stock, outstanding (in shares)	4,638,000	4,734,000
Treasury stock, at cost (in shares)	464,000	369,000