Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets
Accounts receivable, allowances	$ 25	$ 25
Property, equipment and leasehold improvements, accumulated depreciation and amortization	55,478	50,408
Intangible and other assets, accumulated amortization	$ 1,029	$ 1,290
Common shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, authorized (in Shares)	50,000,000	50,000,000
Common stock, Issued (in Shares)	18,844,817	18,819,053
Common stock, Outstanding (in shares)	18,844,817	18,819,053