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Note 11 - Costs to Obtain and Fulfill a Contract - Capitalized Contract Costs Activity (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Deferred Costs of Acquisition [Member] |  |
Balance | $ 1,390 |
Capitalization of costs | 924 |
Amortization of costs | (914) |
Balance | 1,400 |
Domain Registration Costs [Member] |  |
Balance | 106,527 |
Capitalization of costs | 161,400 |
Amortization of costs | (169,100) |
Acquired in a business combination | 10,318 | [1]
Deferral of costs | 161,385 |
Recognized costs | (169,063) |
Balance | $ 109,167 |
[1] | The Company acquired Ascio on March 18, 2019. As part of the transition, the Company acquired active domain name contracts with a terms ranging from 1 - 10 years, for which fees to suppliers were paid in advance.

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 (decrease) capitalized contract cost from business combination. + References No definition available. + Details
Name: | tcx_CapitalizedContractCostIncreaseDecreaseForContractAcquiredInBusinessCombination
Namespace Prefix: | tcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 of increase (decrease) in capitalization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References No definition available. + Details
Name: | tcx_IncreaseDecreaseInCapitalizedCosts
Namespace Prefix: | tcx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://www.xbrl.org/2003/role/disclosureRef -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 + Details
Name: | us-gaap_CapitalizedContractCostAmortization
Namespace Prefix: | us-gaap_
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: |

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