Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 0	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares, Issued	14,398,000	14,365,000
Common Stock, Shares, Outstanding	14,398,000	14,365,000
Treasury Stock, Shares	2,093	1,347
Convertible Senior Subordinted Notes Due 2023 [Member] | Senior Notes [Member]
3/4% convertible senior subordinated notes due 2023	0.75%	0.75%