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Note 9 - Stockholders' Equity
 9 Months Ended
May. 31, 2015
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Note Disclosure [Text Block]
9. 
STOCKHOLDERS’ EQUITY

During the nine months ended May 31, 2015, the Company did not purchase or retire any shares of its common stock.  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

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 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.

During the nine months ended May 31, 2014, the Company did not purchase or retire any shares of its common stock.  The following stock options to purchase shares of common stock were exercised during the nine months ended May 31, 2014:

Options Exercised
Exercise Price
44,000
$ 7.65

The Company granted stock options under the 2007 Plan to purchase an aggregate of 56,373 shares of its common stock to various employees and directors during the nine months ended May 31, 2014.  The weighted average per share exercise price of the stock options is $14.83, which was equal to the fair market value of the Company’s common stock on the date of grant.