Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (Parentheticals) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Mar. 31, 2010
Convertible Notes 2017 [Member]
Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (Parentheticals) [Line Items]
Carrying Amount	8.50%
Carrying Amount	$ 19,300	$ 0
2015 Convertible Notes [Member]
Note 13 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (Parentheticals) [Line Items]
Carrying Amount	6.50%	6.50%	6.50%
Carrying Amount	$ 5,300	$ 17,400	$ 34,600