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Note 2 - Business Acquisitions and Others (Details Textual) € in Millions, shares in Millions |  |  | 1 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 26, 2017 shares | Mar. 15, 2017 USD ($) | Jul. 31, 2016 USD ($) MWh | Jul. 31, 2016 EUR (€) MWh | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill |  |  |  |  | $ 21,037,000 | $ 21,037,000 | $ 6,650,000 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  | 35,300,000 | 20,135,000 |
Payments for Achievement of Production Goal |  |  |  |  |  | 8,032,000 |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount |  |  |  |  |  |  | 11,081,000 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  | 84,322,000 | 84,322,000 | $ 91,582,000 |
Viridity Energy, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 35,300,000 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 12,400,000 |  |  | 10,300,000 | $ 10,300,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 34,700,000 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 19 years |  |  |  | 19 years |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital |  | $ 400,000 |  |  |  |  |  |
Goodwill |  | $ 13,400,000 |  |  |  |  |  |
Viridity Energy, Inc. [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  | (600,000) |  |  |
Geothermie Bouillante SA (“GB”) [Member] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 7,100,000 |  |  |  |  |
Expected Power Generating Capacity | MWh |  |  | 14.75 | 14.75 |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 60.00% |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 20.60 |  |  |  |  |
Payments to Acquire Businesses, Additional Amount Subject to Achievement of Agreed upon Production Thresholds |  |  | $ 13,400,000 |  |  | $ 3,600,000 |  |
Payments for Achievement of Production Goal |  |  |  |  |  | 8,000,000 |  |
Power Purchase Agreements Term |  |  | 15 years | 15 years |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount |  |  |  |  | 5,000,000 | 5,000,000 |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  | $ 8,300,000 | $ 8,300,000 |  |
Geothermie Bouillante SA (“GB”) [Member] | Service Agreements [Member] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 33,000,000 |  |  |  |  |
Geothermie Bouillante SA (“GB”) [Member] | After Further Invest in Two Years [Member] |  |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries |  |  | $ 8,400,000 | € 7.5 |  |  |  |
Business Combination, Expected Ownership Interest |  |  | 63.75% |  |  |  |  |
Geothermie Bouillante SA (“GB”) [Member] | Ormat Systems LTD and Caisse des Depots et Consignations (CDC) [Member] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 80.00% |  |  |  |  |
Business Combination, Co-acquisition, Percentage of Ownership Interest Allocated |  |  | 75.00% |  |  |  |  |
Geothermie Bouillante SA (“GB”) [Member] | Caisse des Depots et Consignations (CDC) [Member] |  |  |  |  |  |  |  |
Business Combination, Co-acquisition, Percentage of Ownership Interest Allocated |  |  | 25.00% |  |  |  |  |
ORIX Corporation [Member] |  |  |  |  |  |  |  |
Number of Shares Purchased by Investor | shares | 11 |  |  |  |  |  |  |
Percentage Ownership in Company Purchased by Investor | 22.00% |  |  |  |  |  |  |
Voting Rights, Number of Directors Designated | 3 |  |  |  |  |  |  |
Number of Directors after Acquisition Transaction | 9 |  |  |  |  |  |  |
Voting Rights, Effective Rate Cap | 25.00% |  |  |  |  |  |  |

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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