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Note 12 - Puna Power Plant Lease Transactions (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2005
Dec. 31, 2016
Lease Term   31 years  
Deferred Revenue, Leases, Gross   $ 83,000,000  
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total $ 25,300,000   $ 28,000,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation $ 35,600,000   32,900,000
Lease Payment Term 23 years    
Deferred Costs, Leasing, Gross $ 4,200,000    
Restricted Cash and Cash Equivalents, Total 7,900,000   2,900,000
Cash, Ending Balance $ 0   $ 0