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Liquidity (Details Narrative) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loan outstanding $ 2,400us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 2,498us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
EMRISE Electronics Ltd [Member] | Electronic Devices Segment [Member]    
Gross sale price 22,000emri_GrossSalePrice
/ dei_LegalEntityAxis
= emri_EMRISEElectronicsLtdMember
/ us-gaap_StatementBusinessSegmentsAxis
= emri_ElectronicDevicesSegmentMember
 
Lloyds TSB [Member]    
Loan term 3 years  
Long term bank facility 1,800us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= emri_LoanMember
 
Long term bank facility, extension period 2017-04  
Loan outstanding 1,300us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= emri_LoanMember
 
Lloyds TSB [Member] | United Kingdom, Pounds [Member]    
Long term bank facility $ 1,700us-gaap_LineOfCredit
/ us-gaap_CurrencyAxis
= currency_GBP
/ us-gaap_DebtInstrumentAxis
= emri_LoanMember