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Note 11 - Geographic And Segment Information (Tables)
 3 Months Ended
Nov. 30, 2013
Note 11 - Geographic And Segment Information (Tables) [Line Items]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three Months Ended
 
   
November 30, 2013
   
November 30, 2012
 
Inside the U.S.A. to unaffiliated customers
    71.1 %     71.2 %
Outside the U.S.A. to:
               
Joint ventures in which the Company is a shareholder directly and indirectly
    10.6       15.3  
Unaffiliated customers
    18.3       13.5  
      100.0 %     100.0 %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended
 
   
November 30, 2013
   
November 30, 2012
 
ZERUST® sales
  $ 5,749,013     $ 4,795,283  
Natur-Tec® sales
    560,087       496,464  
Total Net sales
  $ 6,309,100     $ 5,291,747  
Reconciliation of Cost of Good Sold from Segments to Consolidated [Table Text Block]
   
November 30,
2013
   
% of
Product
Sales*
   
November 30,
2012
   
% of
Product
Sales*
 
Direct cost of goods sold
                       
ZERUST®
  $ 3,081,764       53.6 %   $ 2,644,295       55.1 %
Natur-Tec®
    449,464       80.3 %     439,673       88.6 %
Indirect cost of goods sold
    626,803    
NA
      607,004    
NA
 
Total net cost of goods sold
  $ 4,158,031             $ 3,690,972          
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
At November 30,
2013
   
At August 31,
2013
 
Brazil
  $ 1,538,423     $ 1,419,543  
North America
  $ 50,239,583     $ 47,634,406  
Total assets
  $ 51,778,006     $ 49,053,949  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
 
   
November 30,
2013
   
November 30,
2012
 
Brazil
  $ 602,362     $ 551,814  
North America
    5,706,738       4,739,933  
Total Net sales
  $ 6,309,100     $ 5,291,747  
   
Three Months Ended
 
   
November 30,
2013
   
November 30,
2012
 
Brazil
  $ (56,809 )   $ (23,148 )
North America
    1,571,109       896,812  
Total operating income
  $ 1,514,299     $ 873,664  
Fees For Services Provided to Joint Ventures [Member]
  
Note 11 - Geographic And Segment Information (Tables) [Line Items]  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
   
Three Months Ended November 30,
 
   
2013
   
% of Total Fees
for Services
Provided to
Joint Ventures
   
2012
   
% of Total Fees for
Services Provided
to Joint Ventures
 
China*
  $ 588,182       27.9 %   $ 493,312       26.7 %
Germany
    263,555       12.5 %     242,700       13.1 %
Japan
    173,282       8.2 %     201,981       10.9 %
Poland
    164,567       7.8 %     111,472       6.0 %
Korea*
    161,424       7.7 %     138,742       7.5 %
Thailand*
    152,558       7.2 %     153,687       8.3 %
France
    128,103       6.1 %     128,502       7.0 %
Sweden
    109,970       5.2 %     86,992       4.7 %
Finland
    105,202       5.0 %     87,851       4.8 %
United Kingdom
    74,697       3.5 %     67,058       3.6 %
Other
    188,108       8.9 %     133,980       7.4 %
    $ 2,109,648       100.0 %   $ 1,846,277       100.0 %