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Note 10 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales (Geographic Concentration Risk [Member], Sales Revenue, Net [Member])
 3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Note 10 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]        
Net Sales, Percentage 100.00% 100.00% 100.00% 100.00%
Inside the U.S.A to Unaffiliated Customers [Member]
        
Note 10 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]        
Net Sales, Percentage 62.10% 65.60% 66.60% 68.40%
Joint Ventures In Which The Company Is A Shareholder Directly And Indirectly - Outside the U.S.A [Member]
        
Note 10 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]        
Net Sales, Percentage 12.90% 18.20% 11.70% 16.80%
Unaffiliated Customers - Outside the U.S.A [Member]
        
Note 10 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]        
Net Sales, Percentage 25.00% 16.20% 21.70% 14.80%