Note 15 - Fair Value Measurements and Disclosures (Details) - Fair Value of Company’s Fixed Rate Debt (Parentheticals) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2010
Convertible Notes 2017 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes, Interest Rate	8.50%	8.50%	8.50%
Convertible Notes, Discount	$ 13,900	$ 18,300
Convertible Notes 2015 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes, Interest Rate	6.50%	6.50%
Convertible Notes, Discount	$ 400	$ 4,400		$ 34,600