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Note 2 - Significant Accounting Policies - Summary of Property, Plant and Equipment Depreciation Rates (Details)	12 Months Ended
	Dec. 31, 2017
Leasehold improvements	Over term of lease
Assets under construction
Minimum [Member]
Depreciation term (Year)	4 years
Maximum [Member]
Depreciation term (Year)	15 years
Computer Equipment [Member]
Depreciation rate	30.00%
Computer Software [Member] | Minimum [Member]
Depreciation rate	33.33%
Computer Software [Member] | Maximum [Member]
Depreciation rate	100.00%
Furniture and Fixtures [Member]
Depreciation rate	20.00%
Vehicles and Tools [Member]
Depreciation rate	20.00%
Fiber Network [Member]
Depreciation term (Year)	15 years
Customer Equipment and Installations [Member]
Depreciation term (Year)	3 years

X

- Definition

Represents the assets under construction depreciation term.

+ References

No definition available.

+ Details

Name:	tcx_AssetsUnderConstructionDepreciationTerm
Namespace Prefix:	tcx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents depreciation rate.

+ References

No definition available.

+ Details

Name:	tcx_DepreciationRate
Namespace Prefix:	tcx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the leasehold improvements depreciation term.

+ References

No definition available.

+ Details

Name:	tcx_LeaseholdImprovementsDepreciationTerm
Namespace Prefix:	tcx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tcx_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tcx_VehiclesAndToolsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tcx_FiberNetworkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tcx_CustomerEquipmentAndInstallationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: