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Note 10 - Geographic and Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales (Sales Revenue, Net [Member], Geographic Concentration Risk [Member])
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 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 69.00% 69.80% 67.40% 68.90%
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 13.60% 11.10% 12.40% 14.90%
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 17.40% 19.10% 20.20% 16.20%