TRANSACTIONS - Acquisition of RadTran (Details) - USD ($) $ in Thousands		3 Months Ended
Aug. 16, 2024	Mar. 31, 2025
Asset Acquisition [Line Items]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life	13 years 6 months
RadTran LLC
Asset Acquisition [Line Items]
Cash	$ 1,500
Issuance of Common Shares	$ 1,500	$ 1,500
Asset acquisition, contractual commitment, royalty on future revenues, percentage	2.00%
Fair value of contingent consideration	$ 1,690
RadTran LLC \| Maximum
Asset Acquisition [Line Items]
Fair value of contingent consideration	14,000
Milestone Achievement One \| RadTran LLC
Asset Acquisition [Line Items]
Asset acquisition, contingent consideration, cash	1,000
Asset acquisition, contingent consideration, equity interest issued and issuable	1,000
Milestone Achievement Two \| RadTran LLC
Asset Acquisition [Line Items]
Asset acquisition, contingent consideration, cash	1,000
Asset acquisition, contingent consideration, equity interest issued and issuable	1,000
Milestone Achievement Three \| RadTran LLC
Asset Acquisition [Line Items]
Asset acquisition, contingent consideration, cash	$ 10,000

Asset Acquisition, Contingent Consideration, Cash

No definition available.

Name:	efr_AssetAcquisitionContingentConsiderationCash
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Asset Acquisition, Contingent Consideration, Equity Interest Issued and Issuable

+ References

No definition available.

+ Details

Name:	efr_AssetAcquisitionContingentConsiderationEquityInterestIssuedAndIssuable
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Asset Acquisition, Contractual Commitment, Royalty On Future Revenues, Percentage

+ References

No definition available.

+ Details

Name:	efr_AssetAcquisitionContractualCommitmentRoyaltyOnFutureRevenuesPercentage
Namespace Prefix:	efr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contingent consideration recognized as part of consideration transferred in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480060/805-50-25-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-2

+ Details

Name:	us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of acquirer's equity interest issued and issuable as part of consideration transferred in asset acquisition.

+ References

+ Details

Name:	us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 15
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480123/805-50-15-3

+ Details

Name:	us-gaap_AssetAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_AssetAcquisitionAxis=efr_RadTranLLCAssetAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	efr_TriggeringEventAxis=efr_MilestoneAchievementOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	efr_TriggeringEventAxis=efr_MilestoneAchievementTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	efr_TriggeringEventAxis=efr_MilestoneAchievementThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: