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Debt - Credit Facilities (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 11, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Borrowings |  | $ 2,219,000 | $ 0
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, term | 3 years |  |
Credit facility, maximum borrowing capacity | $ 5,000,000.0 |  |
Credit facility, available percentage of receivables | 85.00% |  |
Credit facility, available threshold, percent | 50.00% |  |
Credit facility, available threshold | $ 500,000 |  |
Credit facility, minimum borrowing capacity | $ 1,000,000.0 |  |
Credit facility, interest rate | 0.50% | 7.75% |
Credit facility, overdraft fee percentage | 2.00% |  |
Stated interest rate | 1.00% |  |
Right to terminate, notice required, period of time | 90 days |  |
Right to terminate, liquidated damages, year one, percent | 3.00% |  |
Right to terminate, liquidated damages, year two, percent | 2.00% |  |
Right to terminate, liquidated damages, year three, percent | 1.00% |  |
Borrowings |  | $ 2,200,000 |
Prime Rate | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, basis spread on variable rate | 2.00% |  |

X
- Definition The percentage of eligible receivables which determines the amount of line of credit available. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. + References No definition available. + Details
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X
- Definition The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line Of Credit Facility, Overdraft Fee Percentage + References No definition available. + Details
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X
- Definition Line of Credit Facility, Minimum Borrowing Capacity + References No definition available. + Details
Name: | efoi_LineofCreditFacilityMinimumBorrowingCapacity
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Right To Terminate, Liquidated Damages, Year One, Percent + References No definition available. + Details
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- Definition Right To Terminate, Liquidated Damages, Year Three, Percent + References No definition available. + Details
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- Definition Right To Terminate, Liquidated Damages, Year Two, Percent + References No definition available. + Details
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- Definition Right to Terminate, Notice Required, Period of Time + References No definition available. + Details
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X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- 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
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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