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Note 9 - Stockholders' Equity
 9 Months Ended
May 31, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
9. STOCKHOLDERS’ EQUITY
 
During the nine months ended May 31, 2016, the Company repurchased and retired 7,511 shares of its common stock. During the nine months ended May 31, 2015, the Company did not repurchase or retire any shares of its common stock.
 
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 53,447 shares of its common stock to various employees and directors during the nine months ended May 31, 2016. The weighted average per share exercise price of the stock options is $14.85, which is equal to the fair market value of the Company’s common stock on the date of grant.
 
During the nine months ended May 31, 2016, no stock options to purchase shares of common stock were exercised.
 
The Company granted stock options under the 2007 Plan to purchase an aggregate of 45,067 shares of its common stock to various employees and directors during the nine months ended May 31, 2015. The weighted average per share exercise price of the stock options is $20.10, which was equal to the fair market value of the Company’s common stock on the date of grant.
 
The following stock options to purchase shares of common stock were exercised during the nine months ended May 31, 2015:
 
Options Exercised
Exercise Price
18,000 $7.65
2,333 $10.20