Note 1 - General and Basis of Presentation - Finance Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finance lease liabilities	$ 3,019	$ 3,169
Finance liability	10,835	0
Total Current Finance Liabilities	13,854	3,169
Finance lease liabilities	4,693	9,104
Finance liability	242,029	0
Total Long-term Finance Liabilities	$ 246,722	$ 9,104

Amount of finance liability, including leases, classified as current.

No definition available.

Name:	ora_FinanceLiabilitiesIncludingLeasesCurrent
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of finance liabilities, including leases, classified as noncurrent.

+ References

No definition available.

+ Details

Name:	ora_FinanceLiabilitiesIncludingLeasesNoncurrent
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current finance liability.

+ References

No definition available.

+ Details

Name:	ora_FinanceLiabilityCurrent
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of finance liability, classified as noncurrent.

+ References

No definition available.

+ Details

Name:	ora_FinanceLiabilityNoncurrent
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

+ Details

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