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Note 11 - Segment and Geographic Information (Tables)
9 Months Ended
May 31, 2020
Notes Tables  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31, 2020   May 31, 2019   May 31, 2020   May 31, 2019
ZERUST
®
net sales
  $
7,356,781
    $
10,077,203
    $
26,322,515
    $
29,250,772
 
Natur-Tec
®
net sales
   
2,388,042
     
4,815,914
     
11,287,491
     
13,051,801
 
Total net sales   $
9,744,823
    $
14,893,117
    $
37,610,006
    $
42,302,573
 
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]
    Three Months Ended   Nine Months Ended
   
 
May 31, 2020
 
    % of Segment Sales*    
 
May 31, 2019
 
    % of Segment Sales*    
 
May 31, 2020
 
    % of Segment Sales*    
 
May 31, 2019
 
    % of Segment Sales*  
Direct cost of goods sold                                
ZERUST
®
  $
4,011,244
     
54.5
%   $
5,725,220
     
56.8
%   $
14,193,113
     
53.9
%   $
16,596,536
     
56.7
%
Natur-Tec
®
   
1,842,539
     
77.2
%    
3,670,282
     
76.2
%    
8,733,016
     
77.4
%    
10,181,050
     
78.0
%
Indirect cost of goods sold    
645,319
     
     
742,851
     
     
2,065,358
     
     
2,106,003
     
 
Total net cost of goods sold   $
6,499,102
     
 
    $
10,138,353
     
 
    $
24,991,487
     
 
    $
28,883,589
     
 
 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31, 2020   May 31, 2019   May 31, 2020   May 31, 2019
Inside the U.S. to unaffiliated customers   $
5,019,363
    $
6,172,882
    $
19,546,708
    $
19,564,756
 
Outside the U.S. to:                                
Joint ventures in which the Company is a shareholder directly and indirectly    
673,751
     
1,112,313
     
1,504,997
     
2,304,455
 
Unaffiliated customers    
4,051,709
     
7,607,922
     
16,558,301
     
20,433,362
 
    $
9,744,823
    $
14,893,117
    $
37,610,006
    $
42,302,573
 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
 
At May 31, 2020
 
 
At August 31, 2019
China   $
377,959
    $
337,162
 
Brazil    
64,540
     
101,548
 
Germany    
25,384
     
14,791
 
India    
65,472
     
61,748
 
United States    
6,430,613
     
6,842,910
 
Total property and equipment   $
6,963,968
    $
7,358,159
 
Revenue from External Customers by Geographic Areas [Table Text Block]
    Three Months Ended   Nine Months Ended
    May 31, 2020   May 31, 2019   May 31, 2020   May 31, 2019
China   $
3,089,135
    $
3,691,220
    $
9,975,091
    $
9,864,479
 
Brazil    
365,222
     
792,299
     
2,080,418
     
2,343,894
 
India    
631,551
     
2,283,346
     
4,727,325
     
6,159,136
 
Other    
1,607,206
     
1,953,370
     
4,268,871
     
4,370,308
 
United States    
4,051,709
     
6,172,882
     
16,558,301
     
19,564,756
 
Total net sales   $
9,744,823
    $
14,893,117
    $
37,610,006
    $
42,302,573
 
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,
2020
% of Total Fees for Services Provided to Joint Ventures May 31,
2019
% of Total Fees for Services Provided to Joint Ventures
Germany   $
199,877
     
22.8
%   $
212,825
     
14.8
%
Poland    
75,118
     
8.6
%    
181,057
     
12.6
%
Japan    
139,268
     
15.9
%    
164,136
     
11.5
%
Sweden    
51,767
     
5.9
%    
137,642
     
9.6
%
India    
24,842
     
2.8
%    
114,705
     
8.0
%
France    
61,716
     
7.0
%    
112,063
     
7.8
%
Thailand    
67,919
     
7.8
%    
109,427
     
7.6
%
South Korea    
54,951
     
6.3
%    
85,732
     
6.0
%
Czech Republic    
46,709
     
5.3
%    
83,086
     
5.8
%
Finland    
52,870
     
6.0
%    
75,135
     
5.2
%
United Kingdom    
52,484
     
6.0
%    
70,972
     
5.0
%
Other    
49,185
     
5.6
%    
87,043
     
6.1
%
    $
876,706
     
100.0
%   $
1,433,823
     
100.0
%
    Nine Months Ended
 
May 31,
2020
  % of Total Fees for Services Provided to Joint Ventures  
May 31,
2019
 
% of Total Fees for Services Provided to Joint Ventures
Germany   $
620,106
     
17.8
%   $
643,154
     
15.0
%
Poland    
441,011
     
12.6
%    
551,430
     
12.8
%
Japan    
453,347
     
13.0
%    
501,432
     
11.6
%
Sweden    
259,671
     
7.4
%    
417,635
     
9.7
%
France    
241,056
     
6.9
%    
328,395
     
7.6
%
Thailand    
261,132
     
7.5
%    
313,075
     
7.3
%
India    
187,826
     
5.4
%    
294,833
     
6.9
%
Czech Republic    
215,923
     
6.2
%    
266,706
     
6.2
%
United Kingdom    
202,241
     
5.8
%    
261,961
     
6.1
%
South Korea    
206,272
     
5.9
%    
259,612
     
6.0
%
Finland    
194,813
     
5.6
%    
221,599
     
5.2
%
Other    
207,846
     
5.9
%    
239,200
     
5.6
%
    $
3,491,244
     
100.0
%   $
4,299,032
     
100.0
%