Note 10 - Restricted Cash and Performance Bonds (Details) - Restricted Cash (USD $)	Dec. 31, 2014	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 2,209,000	$ 5,359,000
Current portion of restricted cash as of the end of the period	0	1,250,000
Long-term portion of restricted cash as of the end of the period	2,209,000	4,109,000
Performance Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	1,559,000	3,459,000
Performance Obligations and Commitments Gas-to-power Site [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	650,000	650,000
Secured Letters of Credit [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	250,000
$40 Million Secured Debt Facility [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	1,000,000
Unsecured Performance Bond [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 0	$ 0

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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