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Note 11 - Segment and Geographic Information - Net Sales by Segment (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Net sales by segment $ 13,315,404 $ 12,213,975 $ 27,409,456 $ 23,757,013
ZERUST [Member]        
Net sales by segment 9,108,395 10,191,459 19,173,569 19,719,196
NaturTec [Member]        
Net sales by segment $ 4,207,009 $ 2,022,516 $ 8,235,887 $ 4,037,817