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Note 11 - Segment and Geographic Information (Tables) | 9 Months Ended
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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 | %

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