XML 54 R36.htm IDEA: XBRL DOCUMENT
v3.20.2

MARKETABLE SECURITIES - Schedule Of Maturity Dates (Details) $ in Thousands | Sep. 30, 2020 USD ($)
--- | ---
Investments, Debt and Equity Securities [Abstract] |
Due in less than 12 months | $ 502
Due in 12 months to two years | 0
Due in greater than two years | 0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | $ 502

X
- Definition Available-for-sale Securities, Debt Maturities, Less Than One Year + References No definition available. + Details
Name: | efr_AvailableforsaleSecuritiesDebtMaturitiesLessThanOneYear
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale Securities, Debt Maturities, Maturing In More Than Two Years, Fair Value + References No definition available. + Details
Name: | efr_AvailableforsaleSecuritiesDebtMaturitiesMaturingInMoreThanTwoYearsFairValue
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale Securities, Debt Maturities, Maturing One Year To Two Years, Fair Value + References No definition available. + Details
Name: | efr_AvailableforsaleSecuritiesDebtMaturitiesMaturingOneYearToTwoYearsFairValue
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration