Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Accounts receivable, allowance	$ 150	$ 300
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized (in shares)	100,000	100,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, issued (in shares)	7,968,547	7,968,547
Common stock in treasury (in shares)	1,819,154	1,819,154