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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
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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%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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