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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | The accompanying unaudited interim consolidated balance sheets, and the related consolidated statements of operations and comprehensive income and cash flows reflect all adjustments, consisting of normal recurring adjustments, that are, in the opinion of management, necessary for a fair presentation of the financial position of Tucows and its subsidiaries as at September 30, 2018 and the results of operations and cash flows for the interim periods ended September 30, 2018 and 2017. The results of operations presented in this Quarterly Report on Form 10 -Q are not necessarily indicative of the results of operations that may be expected for future periods. The accompanying unaudited interim consolidated financial statements have been prepared by Tucows in accordance with the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in the Company's annual audited consolidated financial statements and accompanying notes have been condensed or omitted. Other than the exception noted below, these interim consolidated financial statements and accompanying notes follow the same accounting policies and methods of application used in the annual financial statements and should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2017 included in Tucows' 2017 Annual Report on Form 10 -K filed with the SEC on March 6, 2018 (the “2017 Annual Report”). There have been no material changes to our significant accounting policies and estimates during the nine months ended September 30, 2018 as compared to the significant accounting policies and estimates described in our 2017 Annual Report, except for the adoption of Accounting Standards Update (“ASU”) No. 2014 - 09, Revenue from Contracts with Customers (Topic 606 ) (“ASU 2014 - 09” ). See note 3 – Recent accounting pronouncements for more information. Beginning with the Company’s Quarterly Report on Form 10 -Q ended June 30, 2018 filed with the SEC August 8, 2018, all dollar values of current and comparative figures in the financial statements and accompanying tables have been rounded to the nearest thousand ( $000 ), except when otherwise indicated. During the preparation of these interim financial statements, the Company identified an immaterial error that affects the classification of expenses for the three and nine months ended September 30, 2017. This correction of the comparative periods resulted in a decrease in cost of revenues of $0.3 million, a decrease in sales and marketing expense of $0.2 million, and an increase in general and administrative expenses of $0.5 million for both the three and nine months ended September 30, 2017 compared to the amounts previously reported.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References No definition available. + Details
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