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Note 22 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Royalty Expense |  | $ 0 | $ 0 | $ 0
Letters of Credit Outstanding, Amount |  | 277,700 |  |
Letter Of Credit Fair Value Disclosure |  | 0 |  |
Recorded Unconditional Purchase Obligation |  | 113,400 |  |
Royalty Cap Amount |  | 1,900 | 1,800 |
Royalty Cap Amount LIBOR Rate |  | 900 | 800 |
Operating Leases, Rent Expense |  | 500 | 400 | $ 400
Capital Leased Assets, Gross |  | $ 7,600 |  |
Capital Lease, Period of Payments |  |  |  | 5 years
Former Local Sales Representative vs. Ormat [Member] | Pending Litigation [Member] |  |  |  |
Loss Contingency, Damages Sought, Value | $ 4,800 |  |  |
Loss Contingency, Additional Damages Sought for Ormat Geothermal Products Sales in Chile, Percent | 3.75% |  |  |
Loss Contingency, Damages Sought, Ormat Geothermal Products Sales in Chile, Period | 10 years |  |  |
Minimum [Member] |  |  |  |
Percentage For Royalty To Be Paid |  | 3.50% |  |
Maximum [Member] |  |  |  |
Percentage For Royalty To Be Paid |  | 5.00% |  |
Construction In Process [Member] |  |  |  |
Recorded Unconditional Purchase Obligation |  | $ 54,200 |  |
Geothermal Resource Agreement [Member] |  |  |  |
Royalty Expense |  | $ 19,400 | $ 17,100 | $ 15,400

X
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- Definition The percentage of the Ormat geothermal products sales in Chile award the plaintiff seeks in the legal matter. + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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