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Note 7 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Revolving lines of credit | $ 51.5 |
Deposits | 15.6 | 14.4
Fair Value, Inputs, Level 1 [Member] |  |
Revolving lines of credit |  |
Deposits | 15.6 | 14.4
Fair Value, Inputs, Level 2 [Member] |  |
Revolving lines of credit | 51.5 |
Deposits |  |
Fair Value, Inputs, Level 3 [Member] |  |
Revolving lines of credit |  |
Deposits |  |
Olkaria III OPIC [Member] |  |
Loans | 234.6 | 253.4
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans |  |
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans |  |
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans | 234.6 | 253.4
Olkaria III DEG [Member] |  |
Loans |  | 16.3
Olkaria III DEG [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans |  |
Olkaria III DEG [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans |  |
Olkaria III DEG [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans |  | 16.3
Olkaria IV Loan - DEG 2 [Member] |  |
Loans | 50.7 | 50.9
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans |  |
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans |  |
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans | 50.7 | 50.9
Amatitlan Loan [Member] |  |
Loans | 32.8 | 37.3
Amatitlan Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Loans |  |
Amatitlan Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Loans | 32.8 | 37.3
Amatitlan Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Loans |  |
OrCal Geothermal Inc [Member] |  |
Notes | 34.2 | 37.4
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Notes |  |
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes |  |
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Notes | 34.2 | 37.4
OFC Two Senior Secured Notes [Member] |  |
Notes | 234.6 | 249.0
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Notes |  |
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes |  |
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Notes | 234.6 | 249.0
OFC Senior Secured Notes [Member] |  |
Notes |  | 17.0
OFC Senior Secured Notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Notes |  |
OFC Senior Secured Notes [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes |  | 17.0
OFC Senior Secured Notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Notes |  |
Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 85.5 | 88.9
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Notes |  |
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Notes |  |
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Notes | 85.5 | 88.9
Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bonds | 200.3 | 200.1
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Senior Unsecured Bonds |  |
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Senior Unsecured Bonds |  |
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Senior Unsecured Bonds | 200.3 | 200.1
Other Long-term Debt [Member] |  |
Other long-term debt | 7.0 | 10.4
Other Long-term Debt [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Other long-term debt |  |
Other Long-term Debt [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Other long-term debt |  | 3.3
Other Long-term Debt [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Other long-term debt | $ 7.0 | $ 7.1

X
- 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

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + References No definition available. + Details
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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

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

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

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Namespace Prefix: |
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Balance Type: |
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Namespace Prefix: |
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Balance Type: |
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Balance Type: |
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