Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
Aug. 31, 2019	Aug. 31, 2018
Cost of goods sold	$ 37,970,244	$ 34,165,440
Direct Cost of Goods Sold [Member] \| ZERUST [Member]
Cost of goods sold	21,505,335	24,326,493
Direct Cost of Goods Sold [Member] \| NaturTec [Member]
Cost of goods sold	13,691,038	7,303,439
Indirect Cost of Goods Sold [Member]
Cost of goods sold	$ 2,773,871	$ 2,535,508

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.

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

Name:	us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration