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Note 13 - Geographic and Segment Information (Tables)
 12 Months Ended
Aug. 31, 2015
Fees for Services Provided to Joint Ventures [Member]  
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Fiscal 2015   % of Total Fees for Services Provided to Joint Ventures in Fiscal 2015   Fiscal 2014   % of Total Fees for Services Provided to Joint Ventures in Fiscal 2014   Fiscal 2013   % of Total Fees for Services Provided to Joint Ventures in Fiscal 2013
Germany   $ 873,400       15.3 %   $ 1,032,234       12.7 %   $ 1,004,958       13.7 %
Poland     600,255       10.5 %     652,291       8.0 %     525,282       7.1 %
Japan     599,108       10.5 %     669,522       8.2 %     723,977       9.8 %
Thailand     554,881       9.7 %     604,316       7.4 %     621,807       8.4 %
China     494,080       8.6 %     2,118,018       26.0 %     2,063,369       28.1 %
France     412,608       7.2 %     508,705       6.2 %     496,897       6.8 %
United Kingdom     396,514       6.9 %     385,294       4.7 %     236,125       3.2 %
Sweden     323,610       5.7 %     440,117       5.4 %     415,547       5.7 %
India     277,548       4.9 %     364,918       4.5 %     —       0.0 %
Czech     229,185       4.0 %     288,367       3.6 %     210,827       2.9 %
Korea     192,539       3.4 %     315,916       3.9 %     393,307       5.3 %
Finland     281,620       4.9 %     355,391       4.4 %     321,256       4.4 %
Other     480,143       8.4 %     407,775       5.0 %     339,628       4.6 %
    $ 5,715,491       100.0 %   $ 8,142,863       100.0 %   $ 7,352,980       100.0 %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Fiscal 2015   Fiscal 2014   Fiscal 2013
ZERUST
®
net sales
   $ 26,042,909     $ 23,845,288     $ 20,457,198  
Natur-Tec
®
net sales
     4,279,784       2,980,820       2,044,666  
Total net sales   $ 30,322,693     $ 26,826,108     $ 22,501,864  
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]
    Fiscal 2015   Fiscal 2014   Fiscal 2013
Direct cost of goods sold                        
ZERUST
®
   $ 14,399,456     $ 12,941,234     $ 11,408,604  
Natur-Tec
®
     3,232,353       2,234,736       1,731,398  
Indirect cost of goods sold     2,924,124       2,627,183       2,333,210  
Total net cost of goods sold   $ 20,555,932     $ 17,803,153     $ 15,473,212  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
    Fiscal Year Ended August 31,
    2015   2014   2013
Inside the U.S.A. to unaffiliated customers   $ 19,329,979     $ 17,908,563     $ 16,027,619  
Outside the U.S.A. to:                        
Joint ventures in which the Company is a shareholder directly and indirectly     3,240,980       3,348,158       2,952,612  
Unaffiliated customers     7,751,734       5,569,387       3,521,633  
    $ 30,322,693     $ 26,826,108     $ 22,501,864  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
    At August 31, 2015   At August 31, 2014
Brazil   $ 46,918     $ 115,726  
India     16,402       24,766  
China     45,220       —  
North America     7,184,623       6,337,495  
Total long-lived assets   $ 7,293,163     $ 6,477,987  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Fiscal Year Ended August 31, 2015   Fiscal Year Ended August 31, 2014   Fiscal Year Ended August 31, 2013
Brazil   $ 2,623,938     $ 3,079,695     $ 2,394,486  
India     967,241       581,535       —  
China     1,070,422       —       —  
North America     25,661,092       23,164,878       20,107,378  
Total net sales   $ 30,322,693     $ 26,826,108     $ 22,501,864