XML 43 R30.htm IDEA: XBRL DOCUMENT v3.23.1

MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Marketable Debt Securities and Convertible Note
Cost Basis		$ 11,435
Gross Unrealized Losses		(310)
Gross Unrealized Gains		0
Fair Value		11,125
Marketable equity securities
Cost Basis	$ 2,876	2,876
Gross Unrealized Losses	(1,869)	(1,809)
Gross Unrealized Gains	0	0
Fair Value	1,007	1,067
Cost Basis	121,692	14,311
Gross Unrealized Losses	2,067	2,119
Gross Unrealized Gains	72	0
Fair Value	119,697	$ 12,192
Marketable Debt Securities
Marketable Debt Securities and Convertible Note
Cost Basis	59,359
Gross Unrealized Losses	0
Gross Unrealized Gains	72
Fair Value	59,431
Convertible Note
Marketable Debt Securities and Convertible Note
Cost Basis	59,457
Gross Unrealized Losses	(198)
Gross Unrealized Gains	0
Fair Value	$ 59,259

X

- Definition

Debt Securities, Available-For Sale, Held-To Maturity, And Equity Securities, FV-NI

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesAvailableForSaleHeldToMaturityAndEquitySecuritiesFVNI
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Securities, Available-For Sale, Held-To Maturity, And Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, Before Tax

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesAvailableForSaleHeldToMaturityAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Securities, Available-For Sale, Held-To Maturity, And Equity Securities, FV-NI, Cost

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesAvailableForSaleHeldToMaturityAndEquitySecuritiesFVNICost
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Securities, FV-NI

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesFVNI
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Securities, FV-NI, Cost

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesFVNICost
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt Securities, FV-NI, Gross Unrealized Gain

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesFVNIGrossUnrealizedGain
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Securities, FV-NI, Gross Unrealized Loss

+ References

No definition available.

+ Details

Name:	efr_DebtSecuritiesFVNIGrossUnrealizedLoss
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Equity Securities, FV-NI, Gross Unrealized Gain

+ References

No definition available.

+ Details

Name:	efr_EquitySecuritiesFVNIGrossUnrealizedGain
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Equity Securities, FV-NI, Gross Unrealized Loss

+ References

No definition available.

+ Details

Name:	efr_EquitySecuritiesFVNIGrossUnrealizedLoss
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Marketable Securities, Debt

+ References

No definition available.

+ Details

Name:	efr_MarketableSecuritiesDebtAbstract
Namespace Prefix:	efr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total marketable securities

+ References

No definition available.

+ Details

Name:	efr_TotalMarketableSecurities
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_EquitySecuritiesFvNiCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=efr_MarketableDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=efr_ConvertibleNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: