Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 0	$ 0
Common Stock, Par or Stated Value Per Share (in shares)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (in shares)	40,000	40,000
Common Stock, Shares, Issued (in shares)	14,508	14,365
Common Stock, Shares, Outstanding (in shares)	14,508	14,365
Treasury Stock, Shares (in shares)	2,503	1,458