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Note 6 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - Derivative Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Foreign currency forward contracts, asset	$ 140
Foreign currency forward contracts, liability		$ (1,276)
Foreign currency forward contracts, asset	(140)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Foreign currency forward contracts, asset	158
Foreign currency forward contracts, liability		(1,069)
Foreign currency forward contracts, asset	(158)
Not Designated as Hedging Instrument [Member]
Foreign currency forward contracts, asset	18
Foreign currency forward contracts, liability		$ (207)
Foreign currency forward contracts, asset	$ (18)

X

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=tcx_DerivativeInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: