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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
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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

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- 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

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