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Derivative Instruments (Contractor Option Activity) (Details) - CAD / shares shares in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Stock Options Issuance Outstanding at Beginning	39	40
Stock Options Issuance Exercised	0	(1)
Stock Options Issuance Forfeited	0	0
Stock Options Issuance Expired	0	0
Stock Options Issuance Outstanding at Ending	39	39
Weighted-average Exercise Price Outstanding and Exercisable at Beginning		CAD 1.81
Weighted-average Exercise Price Exercised		2.05
Weighted-average Exercise Price Forfeited		0
Weighted-average Exercise Price Expired		0
Weighted-average Exercise Price Outstanding and Exercisable at Ending	CAD 1.80	CAD 1.80

X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock option issuance

+ References

No definition available.

+ Details

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Namespace Prefix:	fencf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock option issuance exercised

+ References

No definition available.

+ Details

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

X

- Definition

Stock Options Issuance Expired

+ References

No definition available.

+ Details

Name:	fencf_StockOptionsIssuanceExpired
Namespace Prefix:	fencf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock option issuance forfeited

+ References

No definition available.

+ Details

Name:	fencf_StockOptionsIssuanceForfeited
Namespace Prefix:	fencf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average price of options that were either forfeited or expired.

+ 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)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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

X

- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
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Period Type:	duration

X

- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

+ References

No definition available.

+ Details

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