XML 72 R58.htm IDEA: XBRL DOCUMENT
v3.21.2

SUBSEQUENT EVENTS - (Details) |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 27, 2021 USD ($) shares | Oct. 27, 2021 CAD ($) shares | Oct. 28, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares
Subsequent Event [Line Items] |  |  |  |  |  |
Asset Retirement Obligation Held For Sale, Current |  |  |  | $ 242,000 |  | $ 0
Common stock, shares, issued (in shares) | shares |  |  |  | 154,494,078 |  | 134,311,033
Proceeds from issuance of shares |  |  |  | $ 92,122,000 | $ 44,642,000 |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Proceeds from asset purchase agreement | $ 2,000,000 |  |  |  |  |
Asset purchase agreement, shares received (in shares) | shares | 11,860,101 | 11,860,101 |  |  |  |
Asset purchase agreement, shares received, percent outstanding | 19.90% | 19.90% |  |  |  |
Asset purchase agreement, payments per project |  | $ 5,000,000 |  |  |  |
Subsequent Event | Payment to be received on 18-month anniversary |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Asset purchase agreement, payment to be received |  | 3,000,000 |  |  |  |
Subsequent Event | Payment to be received on 36-month anniversary |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Asset purchase agreement, payment to be received |  | $ 3,000,000 |  |  |  |
Subsequent Event | At the Market Program |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock, shares, issued (in shares) | shares |  |  | 1,070,000.00 |  |  |
Price per share (in USD per share) | $ / shares |  |  | $ 8.44 |  |  |
Proceeds from issuance of shares |  |  | $ 8,850,000 |  |  |

X
- Definition Asset Purchase Agreement, Payment To Be Received + References No definition available. + Details
Name: | efr_AssetPurchaseAgreementPaymentToBeReceived
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Asset Purchase Agreement, Payments Per Project + References No definition available. + Details
Name: | efr_AssetPurchaseAgreementPaymentsPerProject
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Asset Purchase Agreement, Shares Received + References No definition available. + Details
Name: | efr_AssetPurchaseAgreementSharesReceived
Namespace Prefix: | efr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Asset Purchase Agreement, Shares Received, Percent Outstanding + References No definition available. + Details
Name: | efr_AssetPurchaseAgreementSharesReceivedPercentOutstanding
Namespace Prefix: | efr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Asset Retirement Obligation Held For Sale, Current + References No definition available. + Details
Name: | efr_AssetRetirementObligationHeldForSaleCurrent
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Proceeds From Asset Purchase Agreement + References No definition available. + Details
Name: | efr_ProceedsFromAssetPurchaseAgreement
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + 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_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | efr_AssetPurchaseAgreementPaymentPeriodAxis=efr_AssetPurchaseAgreementPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | efr_AssetPurchaseAgreementPaymentPeriodAxis=efr_AssetPurchaseAgreementPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=efr_AttheMarketProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |