Note 11 - Puna Power Plant Lease Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2005
Leases [Abstract]
Lease Term	25 years		31 years
Deferred Revenue, Leases, Gross			$ 83,000,000
Capital Leases, Balance Sheet, Assets by Major Class, Net	36,900,000	39,600,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	25,500,000	22,800,000
LeasePaymentTerm	23 years	23 years
Deferred Costs, Leasing, Gross	4,200,000
Restricted Cash and Cash Equivalents	4,300,000	4,400,000
Cash	$ 0	$ 0