CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 42	$ 36
Patents and licenses, accumulated amortization	$ 10,691	$ 10,419
Common stock, par value	$ 0.10	$ 0.10
Common stock, authorized	10,000	10,000
Common stock, issued	3,420	3,420
Treasury shares, shares	1,404	1,404