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LONG-TERM DEBT, EXCLUDING CURRENT MATURITIES (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portions of long-term debt classified as trade payables | $ 15 | $ 67
Accounts Payable and Accrued Liabilities [Member] |  |
Debt Instrument [Line Items] |  |
Capital leases | $ 11 | $ 206

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- Definition Current portions of long-term debt classified as trade payables. + References No definition available. + Details
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Namespace Prefix: | eltk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Capital leases. + References No definition available. + Details
Name: | eltk_FinanceCapitalLeaseLiability
Namespace Prefix: | eltk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |