Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 0	$ 0
Fair value of API equity-method investment	$ 26,871
Par Value (in dollars per share)	$ 0.001	$ 0.001
Shares Authorized (in shares)	40,000	40,000
Shares Issued (in shares)	14,224	14,508
Shares Outstanding (in shares)	11,410	12,005
Treasury stock (in shares)	2,814	2,503
3/4% convertible senior subordinated notes | Convertible Senior Subordinated Notes
Interest rate (as a percent)	0.75%	0.75%