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Note 15 - Other Income, Net (Details Textual) - Joint Marketing Agreement [Member] - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Nonrecurring Gain	$ 1.5	$ 0.5	$ 0.5	$ 0.5
Other Non-recurring Gain, Term of Recognition	3 years

X

- Definition

The term over which the nonrecurring gain is recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	tcx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of gain that is infrequent in occurrence or unusual in nature.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

+ Details

Name:	us-gaap_OtherNonrecurringGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=tcx_JointMarketingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: