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Note 9 - Stockholders' Equity
 3 Months Ended
Nov. 30, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
9.
              STOCKHOLDERS’ EQUITY
 
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 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 the
three
months ended
November
30,
2016.
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.
 
During the
three
months ended
November
30,
2015,
the Company repurchased and retired
3,166
shares of its common stock at a price of
$15.07
per share. No stock options to purchase shares of common stock were exercised during the
three
months ended
November
30,
2015.
 
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 the
three
months ended
November
30,
2015.
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.