Condensed Consolidated Balance Sheets [Parenthetical] (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Allowance for doubtful accounts (in dollars)	$ 0	$ 13
Accumulated depreciation (in dollars)	$ 3,549	$ 3,389
Common Stock, par value (in dollars per share)	$ 0.0005	$ 0.0005
Common Stock, shares authorized	50,000,000	50,000,000
Common Stock, shares issued	19,927,199	19,353,672
Treasury stock, shares	5,336,053	4,646,053