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Note 20 - Transactions With Related Entities (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 12, 2015 | Apr. 01, 2009 | Jul. 31, 2004 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 11, 2015
Common Stock, Shares, Outstanding, Ending Balance |  |  |  | 50,609,051 | 49,667,340 |
Corporate Costs And Other |  |  |  | $ 10,000 |  |
Other Research and Development Expense, Percentage |  |  |  | 10.00% |  |
Ormat Systems Ltd [Member] |  |  |  |  |  |
Operating Lease, Monthly Rent |  | $ 77,000 | $ 52,000 |  |  |
Ormat Industries Ltd. [Member] |  |  |  |  |  |
Percentage of Public Float Before Transition to Noncontrolled Public Company |  |  |  |  |  | 40.00%
Percentage of Public Float After Transition to Noncontrolled Public Company | 76.00% |  |  |  |  |
Share Exchange Shares Granted Per Share | 0.2592 |  |  |  |  |
Conversion of Stock, Shares Issued | 30,200,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,000,000 |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | 48,500,000 |  |  |  |  | 45,500,000
Sale of Stock, Consideration Received on Transaction | $ 15,400,000 |  |  |  |  |
Ormat Industries Ltd. [Member] | Shares Issued to Self, Deducted [Member] |  |  |  |  |  |
Conversion of Stock, Shares Issued | 27,200,000 |  |  |  |  |
Ormat Industries Ltd. [Member] | Sale of Stock, Other Assets Received [Member] |  |  |  |  |  |
Sale of Stock, Consideration Received Per Transaction | $ 600,000 |  |  |  |  |
Ormat Industries Ltd. [Member] | Sale of Stock, Land and Buildings Received [Member] |  |  |  |  |  |
Sale of Stock, Consideration Received Per Transaction | 12,100,000 |  |  |  |  |
Ormat Industries Ltd. [Member] | Sale of Stock, Liabilities Assumed [Member] |  |  |  |  |  |
Sale of Stock, Consideration Received Per Transaction | $ 500,000 |  |  |  |  |

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