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Note 9 - Stockholders' Equity	12 Months Ended
	Aug. 31, 2017
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9. STOCKHOLDERS’ EQUITY On January 15, 2015, the Company’s Board of Directors authorized the repurchase of up to $3,000,000 in shares of common stock through open market purchases or unsolicited or solicited privately negotiated transactions. This program has no expiration date but may be terminated by the Company’s Board of Directors at any time. As of August 31, 2017, up to $2,640,548 in shares of common stock remained available for repurchase under the stock repurchase program. During fiscal 2017, the Company repurchased and retired 14,525 shares of its common stock at an average price of $13.51 per share. During fiscal 2017, stock options to purchase an aggregate of 12,000 shares of common stock at an exercise price of $10.25 per share were exercised. 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 56,677 shares of its common stock to various employees and directors during fiscal 2017. The weighted average per share exercise price of the stock options is $13.40, which was equal to the fair market value of the Company’s common stock on the date of grant. No stock options to purchase shares of common stock were exercised during fiscal 2016. The Company granted stock options under the 2007 Plan to purchase an aggregate of 53,447 shares of its common stock to various employees and directors during fiscal 2016. The weighted average per share exercise price of the stock options is $14.85, which was 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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