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Note 1 - Interim Financial Information	3 Months Ended
Note 1 - Interim Financial Information	Nov. 30, 2017
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. INTERIM FINANCIAL INFORMATION In the opinion of management, the accompanying unaudited consolidated financial statements contain all necessary adjustments, which are of a normal recurring nature, and present fairly the consolidated financial position of Northern Technologies International Corporation and its subsidiaries (the Company) as of November 30, 2017 and August 31, 2017 and the results of their operations for the three months ended November 30, 2017 and 2016 and their cash flows for the three months ended November 30, 2017 and 2016, in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s annual report on Form 10 -K for the fiscal year ended August 31, 2017. These consolidated financial statements also should be read in conjunction with the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section appearing in this report. Operating results for the three months ended November 30, 2017 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 31, 2018. The Company evaluates events occurring after the date of the consolidated financial statements requiring recording or disclosure in the consolidated financial statements.