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Note 18 - Income Taxes - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance at beginning of the year	$ 109,611	$ 70,536	$ 111,280
Additions to valuation allowance	46,560	39,075
Release of valuation allowance	(105,313)		(40,744)
Balance at end of the year	$ 50,858	$ 109,611	$ 70,536

X

- Definition

Amount of increase in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	ora_ValuationAllowanceDeferredTaxAssetAddition
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of decrease in the valuation allowance for a specified deferred tax asset attributable to the release of valuation allowance.

+ References

No definition available.

+ Details

Name:	ora_ValuationAllowanceDeferredTaxAssetRelease
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant