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GENERAL AND SIGNIFICANT ACCOUNTING POLICIES (Annual Rates Of Depreciation Of Fixed Assets) (Details) | 12 Months Ended
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Dec. 31, 2018
Machinery And Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 5.00%
Machinery And Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 33.00%
Leasehold Improvements [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 6.00%
Leasehold Improvements [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 14.00%
Motor Vehicles [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 15.00%
Office Furniture and Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 6.00%
Office Furniture and Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Fixed assets depreciation, Annual percentage rate | 33.00%

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- Definition Fixed Assets Depreciation, Annual Percentage Rate + References No definition available. + Details
Name: | eltk_FixedAssetsDepreciationAnnualPercentageRate
Namespace Prefix: | eltk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |