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Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019
Cost of goods sold |  | $ 6,499,102 | $ 10,138,353 | $ 24,991,487 | $ 28,883,589
Direct Cost of Goods Sold [Member] | ZERUST [Member] |  |  |  |  |
Cost of goods sold |  | $ 4,011,244 | $ 5,725,220 | $ 14,193,113 | $ 16,596,536
Percent of product sales | [1] | 54.50% | 56.80% | 53.90% | 56.70%
Direct Cost of Goods Sold [Member] | NaturTec [Member] |  |  |  |  |
Cost of goods sold |  | $ 1,842,539 | $ 3,670,282 | $ 8,733,016 | $ 10,181,050
Percent of product sales | [1] | 77.20% | 76.20% | 77.40% | 78.00%
Indirect Cost of Goods Sold [Member] |  |  |  |  |
Cost of goods sold |  | $ 645,319 | $ 742,851 | $ 2,065,358 | $ 2,106,003
Percent of product sales | [1] |  |  |  |
[1] | The percent of segment sales is calculated by dividing the direct cost of goods sold for each individual segment category by the net sales for each segment category.

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Details
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- Details
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