Note 9 - Restricted Cash and Performance Bonds (Details) - Restricted Cash (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 9,119	$ 72,799
Current portion of restricted cash as of the end of the period	5,010	25,129
Long-term portion of restricted cash as of the end of the period	4,109	47,670
Performance Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	3,460	3,338
Insurance Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash		825
Performance Obligations And Commitments For The Gas-To-Power Site [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	650	650
Secured Letters Of Credit [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	250	259
$75 Million Secured Debt Facility [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash		35,000
$40 Million Secured Debt Facility [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	4,759	32,727
Unsecured Performance Bond [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 0	$ 0