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Note 11 - Asset Retirement Obligations - Estimated Amounts and Timing of Cash Flows and Assumptions Used for ARO Estimates (Details) | Jul. 31, 2021 yr | Jul. 31, 2020 yr
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Measurement Input, Expected Term [Member] | Minimum [Member] |  |
Asset retirement obligations, measurement input (Year) | 9 | 9
Measurement Input, Expected Term [Member] | Maximum [Member] |  |
Asset retirement obligations, measurement input (Year) | 21 | 21
Measurement Input, Inflation Rate [Member] | Minimum [Member] |  |
Asset retirement obligations, measurement input (Year) | 0.0156 | 0.0156
Measurement Input, Inflation Rate [Member] | Maximum [Member] |  |
Asset retirement obligations, measurement input (Year) | 0.0217 | 0.0217
Measurement Input, Discount Rate [Member] | Minimum [Member] |  |
Asset retirement obligations, measurement input (Year) | 0.055 | 0.055
Measurement Input, Discount Rate [Member] | Maximum [Member] |  |
Asset retirement obligations, measurement input (Year) | 0.0596 | 0.0596

X
- Definition Value of input used to measure asset retirement obligation. + References No definition available. + Details
Name: | uec_AssetRetirementObligationMeasurementInput
Namespace Prefix: | uec_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=uec_MeasurementInputInflationRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |