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Goodwill and Intangible Assets (Details Narrative) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill $ 4,980us-gaap_Goodwill $ 5,283us-gaap_Goodwill $ 5,146us-gaap_Goodwill
Percentage of weighted average cost of capital 15.00%emri_PercentageOfWeightedAverageCostOfCapital    
Minimum [Member]      
Shipments contracts and future opportunities growth at rates 3.00%emri_ShipmentsContractsAndFutureOpportunitiesGrowthAtRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]      
Shipments contracts and future opportunities growth at rates 5.00%emri_ShipmentsContractsAndFutureOpportunitiesGrowthAtRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember