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Note 11 - Costs to Obtain and Fulfill a Contract - Capitalized Contract Costs Activity (Details) - Deferred Costs of Acquisition [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Balance	$ 109,167
Deferral of costs	129,879
Recognized costs	(125,806)
Balance	$ 113,240

X

- Definition

Amount of decrease in capitalized contract cost from recognized revenue.

+ References

No definition available.

+ Details

Name:	tcx_CapitalizedContractCostDecreaseRecognizedRevenue
Namespace Prefix:	tcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase in capitalized contract cost from deferred revenue.

+ References

No definition available.

+ Details

Name:	tcx_CapitalizedContractCostIncreaseFromDeferredRevenue
Namespace Prefix:	tcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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://www.xbrl.org/2003/role/disclosureRef
-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

+ Details

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

X

- Details

Name:	us-gaap_CapitalizedContractCostAxis=tcx_DeferredCostsOfAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: