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Note 1 - Business and Significant Accounting Policies - Property, Plant, and Equipment Estimated Useful Life (Details) | 12 Months Ended
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Dec. 31, 2017
Building [Member] |
Property, plant, and equipment estimated useful lives (Year) | 25 years
Leasehold Improvements [Member] | Minimum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 15 years
Leasehold Improvements [Member] | Maximum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 20 years
Machinery And Equipment - Manufacturing And Drilling [Member] |
Property, plant, and equipment estimated useful lives (Year) | 10 years
Machinery and Equipment - Computers [Member] | Minimum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 3 years
Machinery and Equipment - Computers [Member] | Maximum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 5 years
Furniture and Fixtures [Member] | Minimum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 5 years
Furniture and Fixtures [Member] | Maximum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 15 years
Office Equipment - Other [Member] | Minimum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 5 years
Office Equipment - Other [Member] | Maximum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 10 years
Automobiles [Member] | Minimum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 5 years
Automobiles [Member] | Maximum [Member] |
Property, plant, and equipment estimated useful lives (Year) | 7 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ora_MachineryAndEquipmentManufacturingAndDrillingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ora_MachineryAndEquipmentComputersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ora_OfficeEquipmentOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AutomobilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |