Note 10 - Debt (Details) - Debt (Parentheticals) (USD $) In Thousands, unless otherwise specified							9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended
	Jan. 31, 2011	Sep. 30, 2013 Convertible Notes 2017 [Member]	Dec. 31, 2012 Convertible Notes 2017 [Member]	Sep. 30, 2013 2015 Convertible Notes [Member]	Dec. 31, 2012 2015 Convertible Notes [Member]	Mar. 31, 2010 2015 Convertible Notes [Member]	Sep. 30, 2013 $75 Million Secured Debt Facility [Member]	Dec. 31, 2012 $75 Million Secured Debt Facility [Member]	May 31, 2013 $75 Million Secured Debt Facility [Member]	Jul. 31, 2011 $75 Million Secured Debt Facility [Member]	Sep. 30, 2013 $40 Million Secured Debt Facility [Member]	Dec. 31, 2012 $40 Million Secured Debt Facility [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member]	Jan. 31, 2011 $40 Million Secured Debt Facility [Member]
Note 10 - Debt (Details) - Debt (Parentheticals) [Line Items]
Convertible Notes, Interest Rate		8.50%		6.50%	6.50%	6.50%
Convertible Notes, Discount		$ 19,300	$ 0	$ 5,300	$ 17,400	$ 34,600
Secured Debt Facility, Interest Rate							three month LIBOR plus 9%	three month LIBOR plus 9%			three month LIBOR plus 8%	three month LIBOR plus 8%
Secured Debt Facility, Maximum Borrowing Amount	$ 40,000						$ 75,000	$ 75,000	$ 75,000	$ 75,000	$ 40,000	$ 40,000	$ 25,500	$ 40,000