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Note 12 - Segment and Geographic Information (Tables)
 9 Months Ended
May 31, 2016
Fees for Services Provided to Joint Ventures [Member]  
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Three Months Ended
    May 31,
2016		   % of Total Fees for Services Provided to Joint Ventures   May 31,
2015		   % of Total Fees for Services Provided to Joint Ventures
Germany   $ 242,158       17.9 %   $ 219,182       16.8 %
Poland     167,237       12.4 %     149,771       11.5 %
Japan     148,091       11.0 %     124,772       9.6 %
United Kingdom     135,068       10.0 %     93,229       7.2 %
Thailand     132,548       9.8 %     128,164       9.8 %
France     87,588       6.5 %     108,788       8.4 %
Korea     74,085       5.5 %     70,984       5.4 %
India     70,610       5.2 %     72,285       5.5 %
Sweden     66,239       4.9 %     103,234       7.9 %
Finland     55,876       4.1 %     74,711       5.7 %
Czech Republic     54,537       4.0 %     56,843       4.3 %
Other     117,876       8.7 %     102,001       7.8 %
    $ 1,351,913       100.0 %   $ 1,303,964       100.0 %
    Nine Months Ended
    May 31,
2016		   % of Total Fees for Services Provided to Joint Ventures   May 31,
2015		   % of Total Fees for Services Provided to Joint Ventures
Germany   $ 664,812       17.4 %   $ 660,135       14.9 %
Poland     452,260       11.8 %     437,607       9.9 %
Japan     416,241       10.9 %     409,316       9.2 %
Thailand     395,611       10.4 %     425,316       9.6 %
United Kingdom     292,216       7.7 %     304,600       6.9 %
France     250,373       6.6 %     318,686       7.2 %
Korea     247,730       6.5 %     133,405       3.0 %
India     223,137       5.9 %     215,548       4.9 %
Sweden     189,556       5.0 %     262,451       5.9 %
Finland     177,704       4.7 %     220,926       5.0 %
Czech Republic     176,470       4.6 %     165,492       3.7 %
China     —       0.0 %     516,139       11.6 %
Other     322,274       8.5 %     362,872       8.2 %
    $ 3,808,384       100.0 %   $ 4,432,494       100.0 %
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31, 2016   May 31, 2015   May 31, 2016   May 31, 2015
ZERUST® net sales   $ 7,185,955     $ 7,076,760     $ 19,548,974     $ 19,098,816  
Natur-Tec® net sales     1,500,620       1,200,815       3,866,972       3,121,563  
Total net sales   $ 8,686,575     $ 8,277,575     $ 23,415,946     $ 22,220,379  
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31,
2016		   % of Segment Sales*   May 31,
2015		   % of
Segment
Sales*		   May 31,
2016		   % of
Segment
Sales*		   May 31,
2015		   % of
Segment
Sales*
Direct cost of goods sold                                
ZERUST®   $ 4,028,114       56.1 %   $ 3,942,776       55.7 %   $ 10,968,742       56.1 %   $ 10,452,467       54.7 %
Natur-Tec®     1,119,730       74.6 %     889,976       74.1 %     2,938,927       76.0 %     2,391,599       76.6 %
Indirect cost of goods sold     629,405       —       762,455       —       2,013,227       —       2,215,492       —  
Total net cost of goods sold   $ 5,777,249             $ 5,595,207             $ 15,920,896             $ 15,059,558          
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31, 2016   May 31, 2015   May 31, 2016   May 31, 2015
Inside the U.S.A. to unaffiliated customers   $ 5,559,885     $ 5,337,090     $ 14,762,170     $ 14,200,121  
Outside the U.S.A to:                                
Joint ventures in which the Company is a shareholder directly and indirectly     446,322       580,622       1,967,370       2,588,501  
Unaffiliated customers     2,680,368       2,359,863       6,686,406       5,431,757  
    $ 8,686,575     $ 8,277,575     $ 23,415,946     $ 22,220,379  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
    May 31, 2016   August 31, 2015
Brazil   $ 64,050     $ 46,918  
India     13,664       16,402  
China     164,765       45,220  
United States     7,055,557       7,184,623  
Total long-lived assets   $ 7,298,036     $ 7,293,163  
Revenue from External Customers by Geographic Areas [Table Text Block]
    Nine Months Ended
    May 31, 2016   May 31, 2015
Brazil   $ 1,509,659     $ 2,103,589  
India     911,227       708,635  
China     2,473,733       442,262  
United States     18,521,327       18,965,893  
Total net sales   $ 23,415,946     $ 22,220,379