Note 15 - Stock-Based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions, Employee (Employee Stock Purchase Plan [Member])	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Employee Stock Purchase Plan [Member]
Note 15 - Stock-Based Compensation (Details) - Summary of Stock Option Weighted Average Assumptions, Employee [Line Items]
Risk-free interest rate	0.04%	0.07%	0.06%
Expected life (months)	3 years	3 years	3 years
Expected volatility	9.80%	9.80%	14.80%
Dividend yield	1.38%	1.38%	1.26%