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Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 10,381
Weighted average exchange rate of U.S. dollars	1.3154
Fair value	$ 142
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 9,881
Weighted average exchange rate of U.S. dollars	1.3136
Fair value	$ 127
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 10,327
Weighted average exchange rate of U.S. dollars	1.3174
Fair value	$ 84
Foreign Exchange Forward 4 [Member]
Notional amount of U.S. dollars	$ 30,589
Weighted average exchange rate of U.S. dollars	1.3155
Fair value	$ 353

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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

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

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward3Member
Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward4Member
Namespace Prefix:
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Balance Type:
Period Type: