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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, 2021	May 31, 2020	May 31, 2021		May 31, 2020
Cost of goods sold		$ 10,152,582	$ 6,499,102	$ 26,997,582		$ 24,991,487
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 7,091,220	$ 4,011,244	$ 18,928,272	[1]	$ 14,193,113	[1]
Percent of product sales	[1]	57.30%	54.50%	57.60%		53.90%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 2,251,996	$ 1,842,539	$ 5,703,807	[1]	$ 8,733,016	[1]
Percent of product sales	[1]	74.10%	77.20%	70.40%		77.40%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 809,366	$ 645,319	$ 2,365,503		$ 2,065,358
[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

Represents cost of goods sold as percentage of product sales.

+ References

No definition available.

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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=123367319&loc=SL114868664-224227

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