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Note 8 - Stockholders' Equity	3 Months Ended
	Nov. 30, 2017
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	8.        STOCKHOLDERS’ EQUITY On November 20, 2017, the Company’s Board of Directors declared a cash dividend of $0.10 per share of the Company’s common stock, payable on December 21, 2017 to stockholders of record on December 8, 2017 . During the three months ended November 30, 2017, the Company repurchased no shares of its common stock. During the three months ended November 30, 2017, stock options to purchase an aggregate of 1,500 shares of common stock were exercised at a weighted average exercise price of $10.25 per share. The Company granted stock options under the Northern Technologies International Corporation Amended and Restated 2007 Stock Incentive Plan (the 2007 Plan) to purchase an aggregate of 47,252 shares of its common stock to various employees and directors during the three months ended November 30, 2017. The weighted average per share exercise price of the stock options is $18.35, which was equal to the fair market value of the Company’s common stock on the date of grant. During the three months ended November 30, 2016, the Company repurchased and retired 5,575 shares of its common stock at a price of $12.87 per share. No stock options to purchase shares of common stock were exercised during the three months ended November 30, 2016. The Company issued 891 and 3,029 shares of common stock on September 1, 2017 and 2016, respectively, under the Northern Technologies International Corporation Employee Stock Purchase Plan (the ESPP). The Company granted stock options under the 2007 Plan to purchase an aggregate of 56,677 shares of its common stock to various employees and directors during the three months ended November 30, 2016. The weighted average per share exercise price of the stock options is $13.40, which is equal to the fair market value of the Company’s common stock on the date of grant.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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