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Note 9 - Stockholders' Equity (Details) - Exercised Stock Options - $ / shares	9 Months Ended
	May. 31, 2015	May. 31, 2014
Exercise 1 [Member]
Note 9 - Stockholders' Equity (Details) - Exercised Stock Options [Line Items]
Options Exercised	18,000	44,000
Exercise Price	$ 7.65	$ 7.65
Exercise 2 [Member]
Note 9 - Stockholders' Equity (Details) - Exercised Stock Options [Line Items]
Options Exercised	2,333
Exercise Price	$ 10.20

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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