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Fair Value Measurements (Assets/Liabilities Measured at Fair Value on Recurring Basis) (Parenthetical) (Details) CAD in Thousands, $ in Thousands	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CAD	Dec. 31, 2016 USD ($)
Assumptions used to Determine Fair Value Options [Line Items]
Cash	$ 440	CAD 282	$ 51

X

- Definition

Assumptions used to Determine Fair Value Options [Line Items]

+ References

No definition available.

+ Details

Name:	fencf_AssumptionsUsedToDetermineFairValueOptionsLineItems
Namespace Prefix:	fencf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_Cash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant