Note 1 - Interim Financial Information	9 Months Ended
May 31, 2021
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 May 31, 2021 and August 31, 2020, the results of the Company’s operations for the three and nine months ended May 31, 2021 and 2020, the changes in stockholders’ equity for the three and nine months ended May 31, 2021 and 2020, and the Company’s cash flows for the nine months ended May 31, 2021 and 2020, 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, 2020. 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 and nine months ended May 31, 2021 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 31, 2021. The Company evaluates events occurring after the date of the consolidated financial statements requiring recording or disclosure in the consolidated financial statements. Impact of COVID-19 Pandemic In March 2020, the World Health Organization declared the novel coronavirus (COVID-19) outbreak a global pandemic. As a result of the COVID-19 pandemic and related government mandated restrictions on the Company’s business as well as the businesses of its joint ventures, customers and suppliers, disruption to the Company’s business and the manufacture and sale of its products and services has occurred in the first nine months of fiscal 2021 and is expected to continue during the remainder of fiscal 2021 and possibly beyond.

Note 1 - Interim Financial Information

9 Months Ended

May 31, 2021

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 May 31, 2021 and August 31, 2020, the results of the Company’s operations for the three and nine months ended May 31, 2021 and 2020, the changes in stockholders’ equity for the three and nine months ended May 31, 2021 and 2020, and the Company’s cash flows for the nine months ended May 31, 2021 and 2020, 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, 2020. 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 and nine months ended May 31, 2021 are not necessarily indicative of the results that may be expected for the full fiscal year ending August 31, 2021.

The Company evaluates events occurring after the date of the consolidated financial statements requiring recording or disclosure in the consolidated financial statements.

Impact of COVID-19 Pandemic

In March 2020, the World Health Organization declared the novel coronavirus (COVID-19) outbreak a global pandemic. As a result of the COVID-19 pandemic and related government mandated restrictions on the Company’s business as well as the businesses of its joint ventures, customers and suppliers, disruption to the Company’s business and the manufacture and sale of its products and services has occurred in the first nine months of fiscal 2021 and is expected to continue during the remainder of fiscal 2021 and possibly beyond.