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Note 11 - Segment and Geographic Information (Tables) | 9 Months Ended
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May 31, 2021
Notes Tables |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
ZERUST® net sales |  | $ | 12,378,215 |  |  | $ | 7,356,781 |  |  | $ | 32,882,882 |  |  | $ | 26,322,515 |
Natur-Tec® net sales |  |  | 3,040,309 |  |  |  | 2,388,042 |  |  |  | 8,097,636 |  |  |  | 11,287,491 |
Total net sales |  | $ | 15,418,524 |  |  | $ | 9,744,823 |  |  | $ | 40,980,518 |  |  | $ | 37,610,006 |
Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2021 |  |  | % of Segment Sales* |  |  | 2020 |  |  | % of Segment Sales* |  |  | 2021 |  |  | % of Segment Sales* |  |  | 2020 |  |  | % of Segment Sales* |
Direct cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ZERUST® |  | $ | 7,091,220 |  |  |  | 57.3 | % |  | $ | 4,011,244 |  |  |  | 54.5 | % |  | $ | 18,928,272 |  |  |  | 57.6 | % |  | $ | 14,193,113 |  |  |  | 53.9 | %
Natur-Tec® |  |  | 2,251,996 |  |  |  | 74.1 | % |  |  | 1,842,539 |  |  |  | 77.2 | % |  |  | 5,703,807 |  |  |  | 70.4 | % |  |  | 8,733,016 |  |  |  | 77.4 | %
Indirect cost of goods sold |  |  | 809,366 |  |  |  | — |  |  |  | 645,319 |  |  |  | — |  |  |  | 2,365,503 |  |  |  | — |  |  |  | 2,065,358 |  |  |  | — |
Total net cost of goods sold |  | $ | 10,152,582 |  |  |  |  |  |  | $ | 6,499,102 |  |  |  |  |  |  | $ | 26,997,582 |  |  |  |  |  |  | $ | 24,991,487 |  |  |  |  |
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, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Inside the U.S.A. to unaffiliated customers |  | $ | 6,717,886 |  |  | $ | 4,051,709 |  |  | $ | 16,198,372 |  |  | $ | 16,558,301 |
Outside the U.S.A. to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint ventures in which the Company is a shareholder directly and indirectly |  |  | 1,253,919 |  |  |  | 673,751 |  |  |  | 2,361,165 |  |  |  | 1,504,997 |
Unaffiliated customers |  |  | 7,446,719 |  |  |  | 5,019,363 |  |  |  | 22,420,981 |  |  |  | 19,546,708 |
|  | $ | 15,418,524 |  |  | $ | 9,744,823 |  |  | $ | 40,980,518 |  |  | $ | 37,610,006 |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | At May 31, 2021 |  |  | At August 31, 2020 |
China |  | $ | 384,523 |  |  | $ | 376,088 |
Other |  |  | 421,662 |  |  |  | 172,833 |
United States |  |  | 6,370,827 |  |  |  | 6,561,868 |
Total property and equipment |  | $ | 7,177,012 |  |  | $ | 7,110,789 |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three Months Ended May 31, |  |  | Nine Months Ended May 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
China |  | $ | 4,037,493 |  |  | $ | 3,089,135 |  |  |  | 13,025,127 |  |  | $ | 9,975,091 |
Brazil |  |  | 1,237,586 |  |  |  | 365,222 |  |  |  | 2,756,008 |  |  |  | 2,080,418 |
India |  |  | 1,540,734 |  |  |  | 631,551 |  |  |  | 4,036,208 |  |  |  | 4,727,325 |
Other |  |  | 1,884,825 |  |  |  | 1,607,206 |  |  |  | 4,964,803 |  |  |  | 4,268,871 |
United States |  |  | 6,717,886 |  |  |  | 4,051,709 |  |  |  | 16,198,372 |  |  |  | 16,558,301 |
Total net sales |  | $ | 15,418,524 |  | $ | 9,744,823 |  | $ | 40,980,518 |  | $ | 37,610,006 |
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, |
|  | 2021 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | 2020 |  |  | % of Total Fees for Services Provided to Joint Ventures |
Germany |  | $ | 232,026 |  |  |  | 14.6 | % |  | $ | 199,877 |  |  |  | 22.8 | %
Poland |  |  | 226,174 |  |  |  | 14.2 | % |  |  | 75,118 |  |  |  | 8.6 | %
Japan |  |  | 200,270 |  |  |  | 12.6 | % |  |  | 139,268 |  |  |  | 15.9 | %
Sweden |  |  | 127,710 |  |  |  | 8.0 | % |  |  | 51,767 |  |  |  | 5.9 | %
France |  |  | 119,172 |  |  |  | 7.5 | % |  |  | 61,716 |  |  |  | 7.0 | %
Thailand |  |  | 108,842 |  |  |  | 6.9 | % |  |  | 67,919 |  |  |  | 7.7 | %
India |  |  | 107,021 |  |  |  | 6.7 | % |  |  | 24,842 |  |  |  | 2.8 | %
Czech Republic |  |  | 109,680 |  |  |  | 6.9 | % |  |  | 46,709 |  |  |  | 5.3 | %
United Kingdom |  |  | 113,886 |  |  |  | 7.2 | % |  |  | 52,484 |  |  |  | 6.0 | %
South Korea |  |  | 78,507 |  |  |  | 4.9 | % |  |  | 54,951 |  |  |  | 6.3 | %
Finland |  |  | 75,577 |  |  |  | 4.8 | % |  |  | 52,870 |  |  |  | 6.0 | %
Other |  |  | 90,756 |  |  | 5.7 | % |  | 49,185 |  |  | 5.6 | %
|  | $ | 1,589,621 |  |  | 100.0 | % | $ | 876,706 |  |  | 100.0 | %
|  | Nine Months Ended May 31, |
|  | 2021 |  |  | % of Total Fees for Services Provided to Joint Ventures |  |  | 2020 |  |  | % of Total Fees for Services Provided to Joint Ventures |
Germany |  | $ | 692,770 |  |  |  | 15.8 | % |  | $ | 620,106 |  |  |  | 17.8 | %
Poland |  |  | 626,527 |  |  |  | 14.3 | % |  |  | 441,011 |  |  |  | 12.6 | %
Japan |  |  | 561,725 |  |  |  | 12.8 | % |  |  | 453,347 |  |  |  | 13.0 | %
Sweden |  |  | 365,095 |  |  |  | 8.3 | % |  |  | 259,671 |  |  |  | 7.4 | %
France |  |  | 322,717 |  |  |  | 7.4 | % |  |  | 241,056 |  |  |  | 6.9 | %
Thailand |  |  | 306,151 |  |  |  | 7.0 | % |  |  | 261,132 |  |  |  | 7.5 | %
India |  |  | 290,713 |  |  |  | 6.6 | % |  |  | 187,826 |  |  |  | 5.4 | %
Czech Republic |  |  | 268,571 |  |  |  | 6.1 | % |  |  | 215,923 |  |  |  | 6.2 | %
United Kingdom |  |  | 247,560 |  |  |  | 5.6 | % |  |  | 202,241 |  |  |  | 5.8 | %
South Korea |  |  | 241,805 |  |  |  | 5.5 | % |  |  | 206,272 |  |  |  | 5.9 | %
Finland |  |  | 223,356 |  |  |  | 5.1 | % |  |  | 194,813 |  |  |  | 5.6 | %
Other |  |  | 241,876 |  |  | 5.5 | % |  | 207,846 |  |  | 6.0 | %
|  | $ | 4,388,866 |  |  | 100.0 | % | $ | 3,491,244 |  |  | 100.0 | %

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