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Note 11 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales (Percentage of Total Consolidated Net Sales [Member])
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Note 11 - 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%
Inside the U.S.A to Unaffiliated Customers [Member]
    
Note 11 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]    
Net Sales, Percentage 71.10% 71.20%
Joint Ventures In Which The Company Is A Shareholder Directly And Indirectly - Outside the U.S.A [Member]
    
Note 11 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]    
Net Sales, Percentage 10.60% 15.30%
Unaffiliated Customers - Outside the U.S.A [Member]
    
Note 11 - Geographic And Segment Information (Details) - Net Sales By Geographic Location as Percentage of Total Consolidated Net Sales [Line Items]    
Net Sales, Percentage 18.30% 13.50%