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Note 11 - Segment and Geographic Information (Tables) | 3 Months Ended
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Nov. 30, 2020
Notes Tables |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended |
|  | November 30, 20 20 |  |  | November 30, 201 9 |
ZERUST® net sales |  | $ | 10,220,551 |  |  | $ | 9,949,512 |
Natur-Tec® net sales |  |  | 2,558,561 |  |  |  | 4,681,888 |
Total net sales |  | $ | 12,779,112 |  |  | $ | 14,631,400 |
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block] |
|  | November 30, 20 20 |  |  | % of Product Sales* |  |  | November 30, 201 9 |  |  | % of Product Sales* |
Direct cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ZERUST® |  | $ | 5,771,089 |  |  |  | 56.5 | % |  | $ | 5,543,354 |  |  |  | 55.7 | %
Natur-Tec® |  |  | 1,767,630 |  |  |  | 69.1 | % |  |  | 3,614,419 |  |  |  | 77.2 | %
Indirect cost of goods sold |  |  | 774,602 |  |  | NA |  |  |  | 647,311 |  |  | NA |
Total net cost of goods sold |  | $ | 8,313,321 |  |  |  |  |  |  | $ | 9,805,084 |  |  |  |  |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended |
|  | November 30, 20 20 |  |  | November 30, 201 9 |
Inside the U.S.A. to unaffiliated customers |  | $ | 4,861,355 |  |  | $ | 6,147,086 |
Outside the U.S.A. to: |  |  |  |  |  |  |  |
Joint ventures in which the Company is a shareholder directly and indirectly |  |  | 580,304 |  |  |  | 585,616 |
Unaffiliated customers |  |  | 7,337,453 |  |  |  | 7,898,698 |
|  | $ | 12,779,112 |  |  | $ | 14,631,400 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | At November 30, 20 20 |  |  | At August 31, 20 20 |
China |  | $ | 367,953 |  |  | $ | 376,088 |
Other |  |  | 420,228 |  |  |  | 172,833 |
United States |  |  | 6,436,116 |  |  |  | 6,561,868 |
Total long-lived assets |  | $ | 7,224,297 |  |  | $ | 7,110,789 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended |
|  | November 30, 2020 |  |  | November 30, 201 9 |
China |  | $ | 4,543,978 |  |  | $ | 3,861,572 |
Brazil |  |  | 713,853 |  |  |  | 891,978 |
India |  |  | 1,200,468 |  |  |  | 2,036,210 |
Other |  |  | 1,459,458 |  |  |  | 1,694,554 |
United States |  |  | 4,861,355 |  |  |  | 6,147,086 |
Total net sales |  | $ | 12,779,112 |  |  | $ | 14,631,400 |
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, 20 20 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | November 30, 201 9 |  |  | % of Total Fees for Services Provided to Joint Ventures |
Germany |  | $ | 228,826 |  |  |  | 17.1 | % |  | $ | 212,101 |  |  |  | 15.6 | %
Poland |  |  | 189,410 |  |  |  | 14.2 | % |  |  | 194,978 |  |  |  | 14.4 | %
Japan |  |  | 179,962 |  |  |  | 13.5 | % |  |  | 163,929 |  |  |  | 12.1 | %
France |  |  | 105,907 |  |  |  | 7.9 | % |  |  | 93,631 |  |  |  | 6.9 | %
Sweden |  |  | 90,489 |  |  |  | 6.8 | % |  |  | 109,506 |  |  |  | 8.1 | %
Thailand |  |  | 89,932 |  |  |  | 6.7 | % |  |  | 102,334 |  |  |  | 7.5 | %
India |  |  | 88,208 |  |  |  | 6.6 | % |  |  | 82,960 |  |  |  | 6.1 | %
South Korea |  |  | 85,079 |  |  |  | 6.4 | % |  |  | 76,032 |  |  |  | 5.6 | %
Finland |  |  | 76,283 |  |  |  | 5.7 | % |  |  | 67,942 |  |  |  | 5.0 | %
Czech Republic |  |  | 69,353 |  |  |  | 5.2 | % |  |  | 89,014 |  |  |  | 6.6 | %
United Kingdom |  |  | 61,915 |  |  |  | 4.6 | % |  |  | 85,478 |  |  |  | 6.3 | %
Other |  |  | 71,197 |  |  |  | 5.3 | % |  |  | 80,421 |  |  |  | 5.9 | %
|  | $ | 1,336,561 |  |  |  | 100.0 | % |  | $ | 1,358,325 |  |  |  | 100.0 | %

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