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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

X

- Definition

Other long term debt fair value disclosure.

+ References

No definition available.

+ Details

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- Definition

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+ References

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+ Details

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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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- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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