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Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 6,049
Weighted average exchange rate of U.S. dollars	1.2802
Fair value	$ (50)
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 1,639
Weighted average exchange rate of U.S. dollars	1.2852
Fair value	$ (4)
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 1,599
Weighted average exchange rate of U.S. dollars	1.2831
Fair value	$ (4)
Foreign Exchange Forward 4 [Member]
Notional amount of U.S. dollars	$ 1,444
Weighted average exchange rate of U.S. dollars	1.2809
Fair value	$ (4)
Foreign Exchange Forward 5 [Member]
Notional amount of U.S. dollars	$ 10,731
Weighted average exchange rate of U.S. dollars	1.2815
Fair value	$ (62)

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

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:

X

- Details

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

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tcx_ForeignExchangeForward5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: