Note 9 - Restricted Cash and Performance Bonds (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jul. 31, 2011	Jan. 31, 2011	Jun. 30, 2013 $75 Million Secured Debt Facility [Member]	Dec. 31, 2012 $75 Million Secured Debt Facility [Member]	Jul. 31, 2011 $75 Million Secured Debt Facility [Member]	Jun. 30, 2013 $40 Million Secured Debt Facility [Member]	May 31, 2013 $40 Million Secured Debt Facility [Member]	Dec. 31, 2012 $40 Million Secured Debt Facility [Member]	Jan. 31, 2011 $40 Million Secured Debt Facility [Member]	Jul. 31, 2011 Debt Reserve Account [Member] $75 Million Secured Debt Facility [Member]	Jan. 31, 2011 Debt Reserve Account [Member] $40 Million Secured Debt Facility [Member]
Note 9 - Restricted Cash and Performance Bonds (Details) [Line Items]
Debt Instrument, Face Amount (in Dollars)			$ 75,000	$ 40,000	$ 75,000	$ 75,000	$ 75,000	$ 40,000	$ 25,500	$ 40,000	$ 40,000
Restricted Cash and Cash Equivalents	9,119	72,799										2,500	2,000
Debt Service Reserve Period			15 months	18 months
Restricted Cash and Cash Equivalents, Current	5,010	25,129				9,500		4,800		14,500
Restricted Cash and Cash Equivalents, Noncurrent	$ 4,109	$ 47,670				$ 25,500				$ 18,200