Represents the grant-date fair value of warrants or rights granted during the period.

No definition available.

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Namespace Prefix:	ensv_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of warrants or rights issued during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ensv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of warrants or rights vested during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ensv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Period in which the right to exercise the warrants or rights is no longer contingent on satisfaction of service condition.

+ References

No definition available.

+ Details

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Namespace Prefix:	ensv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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Period Type:	instant

- Definition

The number of warrants issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ensv_WarrantsIssuedInJune2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ensv_WarrantInConnectionWithAmendedSubordinatedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ensv_WarrantIssuedInConnectionWithAmended2017CreditAgreementMember
Namespace Prefix:
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Note 11 - Stockholders' Equity (Details Textual)					1 Months Ended		3 Months Ended	5 Months Ended	9 Months Ended
Note 11 - Stockholders' Equity (Details Textual)	Sep. 23, 2020 $ / shares shares	Nov. 11, 2019 $ / shares shares	Jun. 21, 2017 shares	Dec. 21, 2016 shares	Nov. 20, 2020	Jun. 30, 2016 $ / shares shares	Sep. 30, 2020 $ / shares shares	Nov. 20, 2020	Sep. 30, 2020 $ / shares shares	Dec. 31, 2019 $ / shares
Class of Warrant or Right, Issued During Period (in shares)									15,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 0.25		$ 0.25	$ 0.22
Stock Issued During Period, Shares, Issued for Services (in shares)							0		0
Reverse Stock Split [Member] \| Forecast [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio					15
Reverse Stock Split [Member] \| Minimum [Member] \| Forecast [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								25
Reverse Stock Split [Member] \| Maximum [Member] \| Forecast [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio								10
Conversion from 2017 Credit Agreement Loan Concession to Common Stock [Member]
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares)	1
Warrants Issued in June 2016 [Member]
Class of Warrant or Right, Issued During Period (in shares)						30,000
Class of Warrant or Right, Grants in Period, Grant Date Fair Value (in dollars per share) \| $ / shares						$ 0.36
Class of Warrants or Rights, Vesting Period (Year)						1 year
Class of Warrants or Rights, Vested During the Period (in shares)			15,000	15,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 0.70		$ 0.70
Warrant In Connection With Amended Subordinated Loan [Member]
Class of Warrant or Right, Issued During Period (in shares)		1
Class of Warrant or Right, Grants in Period, Grant Date Fair Value (in dollars per share) \| $ / shares		$ 0.16
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 0.20
Warrants and Rights Outstanding, Term (Year)		5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		625,000
Warrant Issued in Connection with Amended 2017 Credit Agreement [Member]
Class of Warrant or Right, Grants in Period, Grant Date Fair Value (in dollars per share) \| $ / shares	$ 0.09
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 0.25
Warrants and Rights Outstanding, Term (Year)	5 years
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)	15,000,000