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Note 13 - Segment and Geographic Information (Tables) | 9 Months Ended
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May 31, 2022
Notes Tables |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
ZERUST® net sales |  | $ | 14,446,832 |  |  | $ | 12,378,215 |  |  | $ | 41,988,394 |  |  | $ | 32,882,882 |
Natur-Tec® net sales |  |  | 4,518,089 |  |  |  | 3,040,309 |  |  |  | 11,918,579 |  |  |  | 8,097,636 |
Total net sales |  | $ | 18,964,921 |  |  | $ | 15,418,524 |  |  | $ | 53,906,973 |  |  | $ | 40,980,518 |
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2022 |  |  | % of Product Sales* |  |  | 2021 |  |  | % of Product Sales* |  |  | 2022 |  |  | % of Product Sales* |  |  | 2021 |  |  | % of Product Sales* |
Direct cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ZERUST® |  | $ | 8,409,392 |  |  |  | 58.2 | % |  | $ | 7,091,220 |  |  |  | 57.3 | % |  | $ | 25,267,333 |  |  |  | 60.2 | % |  | $ | 18,928,272 |  |  |  | 57.6 | %
Natur-Tec® |  |  | 3,432,152 |  |  |  | 76.0 | % |  |  | 2,251,996 |  |  |  | 74.1 | % |  |  | 9,129,686 |  |  |  | 76.6 | % |  |  | 5,703,807 |  |  |  | 70.4 | %
Indirect cost of goods sold |  |  | 881,289 |  |  |  | — |  |  |  | 809,366 |  |  |  | — |  |  |  | 2,580,601 |  |  |  | — |  |  |  | 2,365,503 |  |  |  | — |
Total net cost of goods sold |  | $ | 12,722,833 |  |  |  |  |  |  | $ | 10,152,582 |  |  |  |  |  |  | $ | 36,977,620 |  |  |  |  |  |  | $ | 26,997,582 |  |  |  |  |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Inside the U.S.A. to unaffiliated customers |  | $ | 6,884,726 |  |  | $ | 6,717,886 |  |  | $ | 18,157,010 |  |  | $ | 16,198,372 |
Outside the U.S.A. to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint ventures in which the Company is a shareholder directly and indirectly |  |  | 528,665 |  |  |  | 1,253,919 |  |  |  | 2,252,618 |  |  |  | 2,361,165 |
Unaffiliated customers |  |  | 11,551,530 |  |  |  | 7,446,719 |  |  |  | 33,497,345 |  |  |  | 22,420,981 |
|  | $ | 18,964,921 |  |  | $ | 15,418,524 |  |  | $ | 53,906,973 |  |  | $ | 40,980,518 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | As of May 31, 2022 |  |  | As of August 31, 2021 |
China |  | $ | 5,528,663 |  |  | $ | 5,110,071 |
Other |  |  | 617,674 |  |  |  | 453,199 |
United States |  |  | 6,642,735 |  |  |  | 6,967,761 |
Total property and equipment and patents |  | $ | 12,789,072 |  |  | $ | 12,531,031 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
China |  | $ | 3,624,396 |  |  | $ | 4,037,493 |  |  | $ | 11,845,989 |  |  |  | 13,025,127 |
Brazil |  |  | 1,554,364 |  |  |  | 1,237,586 |  |  |  | 3,786,670 |  |  |  | 2,756,008 |
India |  |  | 4,824,004 |  |  |  | 1,540,734 |  |  |  | 13,369,769 |  |  |  | 4,036,208 |
Other |  |  | 2,077,431 |  |  |  | 1,884,825 |  |  |  | 6,747,535 |  |  |  | 4,964,803 |
United States |  |  | 6,884,726 |  |  |  | 6,717,886 |  |  |  | 18,157,010 |  |  |  | 16,198,372 |
Total net sales |  | $ | 18,964,921 |  |  | $ | 15,418,524 |  |  | $ | 53,906,973 |  |  | $ | 40,980,518 |
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, |
|  | 2022 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | 2021 |  |  | % of Total Fees for Services Provided to Joint Ventures |
Germany |  | $ | 204,316 |  |  |  | 15.4 | % |  | $ | 232,026 |  |  |  | 14.6 | %
Poland |  |  | 171,181 |  |  |  | 12.9 | % |  |  | 226,174 |  |  |  | 14.2 | %
Japan |  |  | 168,075 |  |  |  | 12.6 | % |  |  | 200,270 |  |  |  | 12.6 | %
France |  |  | 123,869 |  |  |  | 9.3 | % |  |  | 119,172 |  |  |  | 7.5 | %
Sweden |  |  | 130,681 |  |  |  | 9.8 | % |  |  | 127,710 |  |  |  | 8.0 | %
United Kingdom |  |  | 89,363 |  |  |  | 6.7 | % |  |  | 113,886 |  |  |  | 7.2 | %
Thailand |  |  | 95,574 |  |  |  | 7.2 | % |  |  | 108,842 |  |  |  | 6.8 | %
Finland |  |  | 92,036 |  |  |  | 6.9 | % |  |  | 75,577 |  |  |  | 4.8 | %
Czech Republic |  |  | 84,797 |  |  |  | 6.4 | % |  |  | 109,680 |  |  |  | 6.9 | %
South Korea |  |  | 78,542 |  |  |  | 5.9 | % |  |  | 78,507 |  |  |  | 4.9 | %
Other |  |  | 91,554 |  |  |  | 6.9 | % |  |  | 197,777 |  |  |  | 12.4 | %
|  | $ | 1,329,988 |  |  |  | 100.0 | % |  | $ | 1,589,621 |  |  |  | 100.0 | %
|  | Nine Months Ended May 31, |
|  | 2022 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | 2021 |  |  | % of Total Fees for Services Provided to Joint Ventures |
Germany |  | $ | 639,738 |  |  |  | 16.7 | % |  | $ | 692,770 |  |  |  | 15.8 | %
Poland |  |  | 520,807 |  |  |  | 13.6 | % |  |  | 626,527 |  |  |  | 14.3 | %
Japan |  |  | 486,815 |  |  |  | 12.7 | % |  |  | 561,725 |  |  |  | 12.8 | %
France |  |  | 355,827 |  |  |  | 9.3 | % |  |  | 322,717 |  |  |  | 7.4 | %
Sweden |  |  | 337,929 |  |  |  | 8.8 | % |  |  | 365,095 |  |  |  | 8.3 | %
United Kingdom |  |  | 271,027 |  |  |  | 7.1 | % |  |  | 247,560 |  |  |  | 5.6 | %
Thailand |  |  | 271,046 |  |  |  | 7.1 | % |  |  | 306,151 |  |  |  | 7.0 | %
Finland |  |  | 257,635 |  |  |  | 6.7 | % |  |  | 223,356 |  |  |  | 5.1 | %
Czech Republic |  |  | 224,280 |  |  |  | 5.8 | % |  |  | 268,571 |  |  |  | 6.1 | %
South Korea |  |  | 205,342 |  |  |  | 5.4 | % |  |  | 241,805 |  |  |  | 5.5 | %
Other |  |  | 265,309 |  |  |  | 6.9 | % |  |  | 532,589 |  |  |  | 12.1 | %
|  | $ | 3,835,755 |  |  |  | 100.0 | % |  | $ | 4,388,866 |  |  |  | 100.0 | %

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