Note 11 - Segment and Geographic Information (Tables)

12 Months Ended

Aug. 31, 2021

Notes Tables

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

	Fiscal 2021		Fiscal 2020
ZERUST® net sales	$	45,554,434	$	34,474,535
Natur-Tec® net sales		10,939,385		13,164,156
Total net sales	$	56,493,819	$	47,638,691

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

	Fiscal 2021		Fiscal 2020
Direct cost of goods sold
ZERUST®	$	26,028,555	$	18,717,684
Natur-Tec®		7,717,429		10,168,051
Indirect cost of goods sold		3,174,830		2,723,539
Total net cost of goods sold	$	36,920,814	$	31,609,274

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

	Fiscal Year Ended August 31,
	2021		2020
Inside the U.S.A. to unaffiliated customers	$	22,039,456	$	20,218,213
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		3,023,196		1,972,646
Unaffiliated customers		31,431,167		25,447,832
	$	56,493,819	$	47,638,691

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

	At August 31, 2021		At August 31, 2020
China	$	5,110,071	$	376,088
Other		453,199		172,833
United States		6,258,188		6,561,868
Total long-lived assets	$	11,821,458	$	7,110,789

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

	Fiscal Year Ended August 31, 2021		Fiscal Year Ended August 31, 2020
China	$	17,343,623	$	13,409,770
Brazil		4,122,781		2,753,930
India		5,482,989		5,655,797
Other		7,504,970		5,600,982
United States		22,039,456		20,218,212
Total net sales	$	56,493,819	$	47,638,691

Fees for Services Provided to Joint Ventures [Member]

Notes Tables

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

	Fiscal 2021		% of Total Fees for Services Provided to Joint Ventures			Fiscal 2020		% of Total Fees for Services Provided to Joint Ventures
Germany	$	920,902		15.4	%	$	843,752		18.3	%
Japan		826,403		13.9	%		628,889		13.6	%
Poland		798,570		13.4	%		553,198		12.0	%
Sweden		528,755		8.9	%		372,017		8.1	%
France		435,032		7.3	%		310,661		6.7	%
Thailand		399,563		6.7	%		328,452		7.1	%
India		392,074		6.6	%		250,976		5.4	%
Czech Republic		377,395		6.3	%		270,032		5.9	%
South Korea		317,042		5.3	%		266,703		5.8	%
United Kingdom		316,786		5.3	%		255,121		5.5	%
Finland		298,663		5.0	%		256,375		5.6	%
Indonesia		122,513		2.1	%		99,543		2.2	%
Other		230,562		3.8	%		177,167		3.8	%
	$	5,964,260		100.0	%	$	4,612,885		100.0	%