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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, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Cost of goods sold		$ 10,138,353	$ 8,592,366	$ 28,883,589	$ 24,493,672
Direct Cost of Goods Sold [Member] | ZERUST [Member]
Cost of goods sold		$ 5,725,220	$ 6,139,699	$ 16,596,536	$ 17,948,941
Percent of product sales	[1]	56.80%	59.10%	56.70%	59.60%
Direct Cost of Goods Sold [Member] | NaturTec [Member]
Cost of goods sold		$ 3,670,282	$ 1,812,084	$ 10,181,050	$ 4,738,523
Percent of product sales	[1]	76.20%	71.30%	78.00%	72.00%
Indirect Cost of Goods Sold [Member]
Cost of goods sold		$ 742,851	$ 640,583	$ 2,106,003	$ 1,806,208
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

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://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=116634182&loc=SL114868664-224227

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