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Note 12 - Geographic and Segment Information (Tables)
 3 Months Ended
Nov. 30, 2015
Fees for Services Provided to Joint Ventures [Member]  
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Three Months Ended
    November 30,
2015		   % of Total Fees
for Services
Provided to
Joint Ventures		   November 30,
2014		   % of Total Fees
for Services
Provided to
Joint Ventures
Germany   $ 229,785       15.5 %   $ 238,321       11.2 %
Thailand     223,741       15.1 %     140,634       6.6 %
Korea     169,402       11.4 %     191,499       9.0 %
Poland     139,257       9.4 %     171,223       8.0 %
Japan     130,673       8.8 %     160,341       7.5 %
United Kingdom     108,911       7.3 %     96,371       4.5 %
France     89,673       6.0 %     133,379       6.3 %
India     80,451       5.4 %     69,291       3.2 %
Sweden     72,961       4.9 %     86,920       4.1 %
Finland     68,933       4.6 %     93,522       4.4 %
China     -       0.0 %     516,139       24.2 %
Other     171,642       11.6 %     236,030       11.0 %
    $ 1,485,429       100.0 %   $ 2,133,670       100.0 %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Three Months Ended
    November 30, 2015   November 30, 2014
ZERUST® net sales   $ 5,977,682     $ 6,238,071  
Natur-Tec® net sales     1,046,755       976,024  
Total net sales   $ 7,024,437     $ 7,214,095  
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]
    November 30, 2015   % of
Product
Sales*		   November 30, 2014   % of
Product
Sales*
Direct cost of goods sold                                
ZERUST®   $ 3,364,555       56.3 %   $ 3,338,588       53.5 %
Natur-Tec®     834,259       79.7 %     782,575       80.2 %
Indirect cost of goods sold     676,609      
NA
       685,448      
NA
  
Total net cost of goods sold   $ 4,875,423             $ 4,806,611          
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
    Three Months Ended
    November 30, 2015   November 30, 2014
Inside the U.S.A. to unaffiliated customers   $ 1,661,631     $ 1,526,930  
Outside the U.S.A. to:                
Joint ventures in which the Company is a shareholder directly and indirectly     549,546       808,987  
Unaffiliated customers     4,813,260       4,878,179  
    $ 7,024,437     $ 7,214,095  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
    At
November 30, 2015		   At
August 31, 2015
Brazil   $ 39,958     $ 46,918  
India     15,337       16,402  
China     120,410       45,220  
United States     7,218,779       7,184,623  
Total long-lived assets   $ 7,394,484     $ 7,293,163  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Three Months Ended
    November 30, 2015   November 30, 2014
Brazil   $ 448,268     $ 763,585  
India     278,690       206,907  
China     679,755       -  
United States     5,617,724       6,243,603  
Total net sales   $ 7,024,437     $ 7,214,095