| Cover | Jun. 21, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 21, 2022 |
| Entity File Number | 001-32347 |
| Entity Registrant Name | ORMAT TECHNOLOGIES, INC. |
| Entity Central Index Key | 0001296445 |
| Entity Tax Identification Number | 88-0326081 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 6140 Plumas Street |
| Entity Address, City or Town | Reno |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89519-6075 |
| City Area Code | 775 |
| Local Phone Number | 356-9029 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value |
| Trading Symbol | ORA |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
