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Note 8 - Stockholders' Equity
 6 Months Ended
Feb. 28, 2013
Stockholders' Equity Note Disclosure [Text Block]
8.           STOCKHOLDERS’ EQUITY

During the six months ended February 28, 2013, 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 six months ended February 28, 2013:

Options Exercised
Exercise Price
25,140
$9.95
1,734
7.65

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 118,294 shares of its common stock to various employees and directors during the six months ended February 28, 2013.  The weighted average per share exercise price of the stock options is $10.25, which is equal to the fair market value of the Company’s common stock on the date of grant.

During the six months ended February 29, 2012, 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 six months ended February 29, 2012:

Options Exercised
Exercise Price
            1,966
$           7.65

The Company granted stock options under the 2007 Plan to purchase an aggregate of 26,000 shares of its common stock to various employees and directors during the six months ended February 29, 2012.  The weighted average per share exercise price of the stock options is $16.45, which is equal to the fair market value of the Company’s common stock on the date of grant.

During the six months ended February 29, 2012, the Company paid stock bonuses under the 2007 Plan for an aggregate of 42,707 shares of its common stock to various employees at a grant price of $14.42 per share.  The aggregate fair value of the shares of the Company’s common stock as of the date of payment of the stock bonuses was $615,830, based on the closing sale price of a share of the Company’s common stock on the date of payment. The fair value of common stock granted during the six months ended February 29, 2012 was based on fiscal 2011 performance and was included in accrued liabilities at August 31, 2011.