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Note 7 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Estimate of Fair Value Measurement [Member] |  |
Other long-term debt | $ 7.0 | $ 10.4
Reported Value Measurement [Member] |  |
Other long-term debt | 7.9 | 11.2
Olkaria III DEG [Member] |  |
Loans |  | 16.3
Olkaria III DEG [Member] | Estimate of Fair Value Measurement [Member] |  |
Loans |  | 16.3
Olkaria III DEG [Member] | Reported Value Measurement [Member] |  |
Loans |  | 15.8
Olkaria III OPIC [Member] |  |
Loans | 234.6 | 253.4
Olkaria III OPIC [Member] | Estimate of Fair Value Measurement [Member] |  |
Loans | 234.6 | 253.4
Olkaria III OPIC [Member] | Reported Value Measurement [Member] |  |
Loans | 228.6 | 246.6
Olkaria IV Loan - DEG 2 [Member] |  |
Loans | 50.7 | 50.9
Olkaria IV Loan - DEG 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Loans | 50.7 | 50.9
Olkaria IV Loan - DEG 2 [Member] | Reported Value Measurement [Member] |  |
Loans | 50.0 | 50.0
Amatitlan Loan [Member] |  |
Loans | 32.8 | 37.3
Amatitlan Loan [Member] | Estimate of Fair Value Measurement [Member] |  |
Loans | 32.8 | 37.3
Amatitlan Loan [Member] | Reported Value Measurement [Member] |  |
Loans | 33.3 | 36.8
Ormat Funding Corp [Member] | Estimate of Fair Value Measurement [Member] |  |
Notes |  | 17.0
Ormat Funding Corp [Member] | Reported Value Measurement [Member] |  |
Notes |  | 17.0
OrCal Geothermal Inc [Member] |  |
Notes | 34.2 | 37.4
OrCal Geothermal Inc [Member] | Estimate of Fair Value Measurement [Member] |  |
Notes | 34.2 | 37.4
OrCal Geothermal Inc [Member] | Reported Value Measurement [Member] |  |
Notes | 32.1 | 35.2
OFC Two Senior Secured Notes [Member] |  |
Notes | 234.6 | 249.0
OFC Two Senior Secured Notes [Member] | Estimate of Fair Value Measurement [Member] |  |
Notes | 234.6 | 249.0
OFC Two Senior Secured Notes [Member] | Reported Value Measurement [Member] |  |
Notes | 232.5 | 247.2
Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 85.5 | 88.9
Don A. Campbell 1 ("DAC1") [Member] | Estimate of Fair Value Measurement [Member] |  |
Notes | 85.5 | 88.9
Don A. Campbell 1 ("DAC1") [Member] | Reported Value Measurement [Member] |  |
Notes | 88.3 | 92.4
Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bonds | 200.3 | 200.1
Senior Unsecured Bonds [Member] | Estimate of Fair Value Measurement [Member] |  |
Senior Unsecured Bonds | 200.3 | 200.1
Senior Unsecured Bonds [Member] | Reported Value Measurement [Member] |  |
Senior Unsecured Bonds | $ 204.3 | $ 204.3

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- Definition Other long term debt fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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