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Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 9,878
Weighted average exchange rate of U.S. dollars	1.4283
Foreign currency forward contracts, asset	$ 1,352
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 10,781
Weighted average exchange rate of U.S. dollars	1.4362
Foreign currency forward contracts, asset	$ 1,541
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 20,659
Weighted average exchange rate of U.S. dollars	1.4324
Foreign currency forward contracts, asset	$ 2,893

X

- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageForwardExchangeRate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: