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Note 10 - Stockholders' Equity (Details) - Summary of Warrant Activity (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Summary of Warrant Activity [Abstract] |  |
Warrants Outstanding | 94,549us-gaap_ClassOfWarrantOrRightOutstanding | 969,549us-gaap_ClassOfWarrantOrRightOutstanding
Warrants, Weighted Average Exercise Price During Period | $ 4.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 4.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Exercised | (580,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised |
Exercised | $ 4.30efoi_WarrantsExercisedWeightedAverageExercisePrice |
Cancelled/forfeited | (55,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures |
Cancelled/forfeited | $ 4.30efoi_WarrantsForfeitedWeightedAverageExercisePrice |
Expired | (240,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations |
Expired | $ 5.34efoi_WarrantsExpiredWeightedAverageExercisePrice |

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- Definition The weighted average exercise price of each class of warrants or rights exercised during the period. + References No definition available. + Details
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- Definition The weighted average exercise price of each class of warrants or rights expired during the period. + References No definition available. + Details
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- Definition Weighted average price of warrants forfeited during the period. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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