Note 9 - Exercised Stock Options (Details)	6 Months Ended
	Feb. 29, 2016 $ / shares shares
Exercise 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	18,000
Exercise Price (in dollars per share) | $ / shares	$ 7.65
Exercise 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2,333
Exercise Price (in dollars per share) | $ / shares	$ 10.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0