LEASES (Narrative) (Details)	12 Months Ended
Dec. 31, 2020
Lessee Disclosure [Abstract]
Remaining lease term	6 years 2 months 12 days
Extended period of lease term	5 years

Remaining lease term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	eltk_LesseeLeaseRemainingTerm
Namespace Prefix:	eltk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration