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Note 8 - Segments and Geographic Information (Detail) - Summary of Geographic Long-Lived Assets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Long lived assets	$ 3,387	$ 3,804
United States [Member]
Long lived assets	3,328	3,747
International [Member]
Long lived assets	$ 59	$ 57

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	efoi_LongLivedAssetsDomestic
Namespace Prefix:	efoi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant