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Note 7 - Contracts in Progress | 12 Months Ended
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Dec. 31, 2012
Contracts In Progress [Text Block] | 7. Contracts in Progress Costs and estimated earnings on contracts in progress for the year ending December 31, 2012 and 2011 are summarized in the table below (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Costs incurred on uncompleted contracts |  | $ | 7,067 |  |  | $ | 3,193 |
Estimated earnings |  |  | 1,330 |  |  |  | 855 |
Total revenues |  |  | 8,397 |  |  |  | 4,048 |
Less: billings to date |  |  | 8,762 |  |  |  | 4,031 |
Total |  | $ | (365 | ) |  | $ | 17 |
Balance sheet classification: |  |  |  |  |  |  |  |
Costs in excess of billings on uncompleted contracts |  | $ | 99 |  |  | $ | 171 |
Billings in excess of costs on uncompleted contracts |  |  | (464 | ) |  |  | (154 | )
Total |  | $ | (365 | ) |  | $ | 17 |

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | efoi_ContractsInProgressTextBlock
Namespace Prefix: | efoi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration