Note 5 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cross Currency Interest Rate Contract [Member] \| Deposits and Other and Accounts Payable and Accrued Expenses [Member]
Derivatives, Cash Collateral Deposits	$ 0	$ 0

The amount of derivative cash collateral deposits.

No definition available.

Name:	ora_DerivativesCashCollateralDeposits
Namespace Prefix:	ora_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant