Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Document Information [Line Items]
Entity Central Index Key	0000909494
Entity Registrant Name	TUCOWS INC /PA/
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-32600
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2707366
Entity Address, Address Line One	96 Mowat Avenue
Entity Address, City or Town	Toronto
Entity Address, State or Province	ON
Entity Address, Postal Zip Code	M6K 3M1
Entity Address, Country	CA
City Area Code	416
Local Phone Number	535-0123
Title of 12(b) Security	Common Stock
Trading Symbol	TCX
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,699,567