Note 11 - Segment and Geographic Information - Cost of Goods Sold by Segment (Details) - USD ($)	12 Months Ended
Aug. 31, 2018	Aug. 31, 2017
Cost of goods sold	$ 34,165,440	$ 26,316,511
Direct Cost of Goods Sold [Member] \| ZERUST [Member]
Cost of goods sold	24,326,493	18,996,264
Direct Cost of Goods Sold [Member] \| NaturTec [Member]
Cost of goods sold	7,303,439	4,925,061
Indirect Cost of Goods Sold [Member]
Cost of goods sold	$ 2,535,508	$ 2,395,186

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=115205541&loc=SL114868664-224227

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