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Leases (Schedule of maturities of lease liabilities) (Details) $ in Thousands | Dec. 31, 2022 USD ($)
--- | ---
Maturities of lease liabilities - Year ending December 31 |
2023 | $ 6
Total lease payments | 6
Less amount representing interest | 0
Total | $ 6

X
- Definition Amount of lessee's undiscounted obligation for lease payments for imputed interest. + References No definition available. + Details
Name: | else_FinanceLeaseLiabilityImputedInterest
Namespace Prefix: | else_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease, net of imputed interest. + References No definition available. + Details
Name: | else_FinanceLeaseLiabilityPaymentsDueNetOfImputedInterest
Namespace Prefix: | else_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of lessee's undiscounted obligation for lease payments for finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
Name: | us-gaap_FinanceLeaseLiabilityPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
Name: | us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant