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Note 11 - Contract Costs (Details Textual) xbrli-pure in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)		Sep. 30, 2018 USD ($)		Sep. 25, 2018	Jun. 30, 2018 USD ($)	Jan. 05, 2018	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Capitalized Contract Cost, Net, Total	$ 1,383,000		$ 1,383,000					$ 1,400,000
Contract with Customer, Liability, Revenue Recognized	(57,741,000)		(182,994,000)
Deferred Costs of Acquisition [Member]
Capitalized Contract Cost, Net, Total	1,383,000	[1]	1,383,000	[1]		$ 1,354,000			$ 1,404,000	[1]
Increase (Decrease) in Capitalized Costs	245,000		684,000
Capitalized Contract Cost, Amortization	(216,000)		(705,000)
Capitalized Contract Cost, Impairment Loss	$ 0		$ 0
Deferred Costs of Acquisition [Member] | Minimum [Member]
Capitalized Contract Cost, Amortization Period	2 years		2 years
Deferred Costs of Acquisition [Member] | Maximum [Member]
Capitalized Contract Cost, Amortization Period	10 years		10 years
Domain Registration Costs [Member]
Capitalized Contract Cost, Net, Total	$ 111,226,000		$ 111,226,000			$ 115,456,000			$ 127,003,000
Increase (Decrease) in Capitalized Costs	39,453,000		126,613,000
Capitalized Contract Cost, Amortization	(43,683,000)		(142,390,000)
Capitalized Contract Cost, Impairment Loss	0		0
Domain Name Transfer to Counter Party					240		2,650
Contract with Customer, Liability, Revenue Recognized	$ 1,700,000		$ 16,200,000
Domain Registration Costs [Member] | Minimum [Member]
Capitalized Contract Cost, Amortization Period	1 year		1 year
Domain Registration Costs [Member] | Maximum [Member]
Capitalized Contract Cost, Amortization Period	10 years		10 years
[1] The beginning balance consists entirely of a cumulative adjustment recorded on January 1, 2018 as a result of the modified retrospective adoption of ASU 2014-09. See note 3 – Recent accounting pronouncements for more information.

X

- Definition

The amount of domain names transfered to a counter party.

+ References

No definition available.

+ Details

Name:	tcx_DomainNameTransferToCounterParty
Namespace Prefix:	tcx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of increase (decrease) in capitalization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	tcx_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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X

- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, 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 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054

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X

- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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- Details

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