Note 11 - Segment and Geographic Information (Tables)

3 Months Ended

Nov. 30, 2020

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Three Months Ended
	November 30, 2020		November 30, 2019
ZERUST® net sales	$	10,220,551	$	9,949,512
Natur-Tec® net sales		2,558,561		4,681,888
Total net sales	$	12,779,112	$	14,631,400

Reconciliation of Cost of Goods Sold from Segments to Consolidated [Table Text Block]

	November 30, 2020		% of Product Sales*			November 30, 2019		% of Product Sales*
Direct cost of goods sold
ZERUST®	$	5,771,089		56.5	%	$	5,543,354		55.7	%
Natur-Tec®		1,767,630		69.1	%		3,614,419		77.2	%
Indirect cost of goods sold		774,602	NA				647,311	NA
Total net cost of goods sold	$	8,313,321				$	9,805,084

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Three Months Ended
	November 30, 2020		November 30, 2019
Inside the U.S.A. to unaffiliated customers	$	4,861,355	$	6,147,086
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		580,304		585,616
Unaffiliated customers		7,337,453		7,898,698
	$	12,779,112	$	14,631,400

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	At November 30, 2020		At August 31, 2020
China	$	367,953	$	376,088
Other		420,228		172,833
United States		6,436,116		6,561,868
Total long-lived assets	$	7,224,297	$	7,110,789

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended
	November 30, 2020		November 30, 2019
China	$	4,543,978	$	3,861,572
Brazil		713,853		891,978
India		1,200,468		2,036,210
Other		1,459,458		1,694,554
United States		4,861,355		6,147,086
Total net sales	$	12,779,112	$	14,631,400

Fees for Services Provided to Joint Ventures [Member]

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Three Months Ended
	November 30, 2020		% of Total Fees for Services Provided to Joint Ventures			November 30, 2019		% of Total Fees for Services Provided to Joint Ventures
Germany	$	228,826		17.1	%	$	212,101		15.6	%
Poland		189,410		14.2	%		194,978		14.4	%
Japan		179,962		13.5	%		163,929		12.1	%
France		105,907		7.9	%		93,631		6.9	%
Sweden		90,489		6.8	%		109,506		8.1	%
Thailand		89,932		6.7	%		102,334		7.5	%
India		88,208		6.6	%		82,960		6.1	%
South Korea		85,079		6.4	%		76,032		5.6	%
Finland		76,283		5.7	%		67,942		5.0	%
Czech Republic		69,353		5.2	%		89,014		6.6	%
United Kingdom		61,915		4.6	%		85,478		6.3	%
Other		71,197		5.3	%		80,421		5.9	%
	$	1,336,561		100.0	%	$	1,358,325		100.0	%