XML 70 R56.htm IDEA: XBRL DOCUMENT
v3.21.2

RELATED PARTY TRANSACTIONS (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2021 | Jun. 01, 2020 | Jun. 30, 2016 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Lessor, Operating Lease, Annual Lease Expense | $ 15,000 | $ 12,000 |  |  |  |  |
Lessor, Operating Lease, Monthly Lease Payment | $ 1,250 | $ 1,000 |  |  |  |  |
Royalty percentage of minerals recovered sold under minimum price threshold |  |  | 3.125% |  |  |  |
Mineral price per pound, low range |  |  |  |  |  |  | $ 65.00
Royalty percentage of minerals recovered sold between price thresholds |  |  | 6.25% |  |  |  |
Mineral price per pound, upper range |  |  |  |  |  |  | $ 95.00
Royalty percentage of minerals recovered sold above maximum price threshold |  |  | 7.50% |  |  |  |
Director |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Equity method, ownership percentage |  |  |  | 81.00% |  |  |
Proceeds from Contributed Capital |  |  |  | $ 230,000 | $ 130,000 |  |
Director | Leoncito Project, L.L.C. |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Testing Permit and Lease Option Agreement, Accrued Liability |  |  |  | $ 280,000 |  | $ 0 |
United Nuclear | Director |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Equity method, ownership percentage |  |  |  | 19.00% |  |  |

X
- Definition Lessor, Operating Lease, Annual Lease Expense + References No definition available. + Details
Name: | efr_LessorOperatingLeaseAnnualLeaseExpense
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lessor, Operating Lease, Monthly Lease Payment + References No definition available. + Details
Name: | efr_LessorOperatingLeaseMonthlyLeasePayment
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Mineral Price Per Pound, Low Range + References No definition available. + Details
Name: | efr_MineralPricePerPoundLowRange
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mineral Price Per Pound, Upper Range + References No definition available. + Details
Name: | efr_MineralPricePerPoundUpperRange
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Royalty Percentage of Minerals Recovered, Sold Above Maximum Price Threshold + References No definition available. + Details
Name: | efr_RoyaltyPercentageofMineralsRecoveredSoldAboveMaximumPriceThreshold
Namespace Prefix: | efr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty Percentage of Minerals Recovered, Sold Between Price Thresholds + References No definition available. + Details
Name: | efr_RoyaltyPercentageofMineralsRecoveredSoldBetweenPriceThresholds
Namespace Prefix: | efr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty Percentage of Minerals Recovered, Sold Under Minimum Price Threshold + References No definition available. + Details
Name: | efr_RoyaltyPercentageofMineralsRecoveredSoldUnderMinimumPriceThreshold
Namespace Prefix: | efr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Testing Permit and Lease Option Agreement, Accrued Liability + References No definition available. + Details
Name: | efr_TestingPermitandLeaseOptionAgreementAccruedLiability
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with the amount received by a corporation from a shareholder during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromContributedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=efr_LeoncitoProjectL.L.C.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efr_UnitedNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |