Note 11 - Segment and Geographic Information (Tables)

6 Months Ended

Feb. 28, 2021

Notes Tables

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

	Three Months Ended				Six Months Ended
	February 28, 2021		February 29, 2020		February 28, 2021		February 29, 2020
ZERUST® net sales	$	10,284,116	$	9,016,222	$	20,504,667	$	18,965,734
Natur-Tec® net sales		2,498,766		4,217,561		5,057,327		8,899,449
Total net sales	$	12,782,882	$	13,233,783	$	25,561,994	$	27,865,183

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

	Three Months Ended										Six Months Ended
	February 28, 2021		% of Segment Sales*			February 29, 2020		% of Segment Sales*			February 28, 2021		% of Segment Sales*			February 29, 2020		% of Segment Sales*
Direct cost of goods sold
ZERUST®	$	6,065,963		59.0	%	$	4,638,514		51.4	%	$	11,837,052		57.7	%	$	10,081,686		53.7	%
Natur-Tec®		1,684,180		67.4	%		3,276,058		77.7	%		3,451,810		68.3	%		6,890,477		77.4	%
Indirect cost of goods sold		781,536		—			772,729		—			1,556,138		—			1,420,040		—
Total net cost of goods sold	$	8,531,679				$	8,687,301				$	16,845,000				$	18,492,385

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

	Three Months Ended				Six Months Ended
	February 28, 2021		February 29, 2020		February 28, 2021		February 29, 2020
Inside the U.S.A. to unaffiliated customers		4,619,130		6,359,506		9,480,485		12,506,592
Outside the U.S.A. to:
Joint ventures in which the Company is a shareholder directly and indirectly		526,942		245,630		1,107,246		831,246
Unaffiliated customers		7,636,810		6,628,647		14,974,262		14,527,345
	$	12,782,882	$	13,233,783	$	25,561,994	$	27,865,183

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

	At February 28, 2021		At August 31, 2020
China	$	374,648	$	376,088
Other		428,677		172,833
United States		6,341,584		6,561,868
Total property and equipment	$	7,144,909	$	7,110,789

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

	Three Months Ended
	February 28, 2021		February 29, 2020
China	$	4,443,656	$	3,024,384
Brazil		804,569		823,218
India		1,295,006		2,059,564
Other		1,620,521		967,111
United States		4,619,130		6,359,506
Total net sales	$	12,782,882	$	13,233,783

	Six Months Ended
	February 28, 2021		February 29, 2020
China	$	8,987,634	$	6,885,956
Brazil		1,518,422		1,715,196
India		2,495,474		4,095,774
Other		3,079,978		2,661,665
United States		9,480,486		12,506,592
Total net sales	$	25,561,994	$	27,865,183

Fees for Services Provided to Joint Ventures [Member]

Notes Tables

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

	Three Months Ended
	February 28, 2021		% of Total Fees for Services Provided to Joint Ventures			February 29, 2020		% of Total Fees for Services Provided to Joint Ventures
Germany	$	231,917		15.9	%	$	208,128		16.6	%
Poland		210,943		14.5	%		170,916		13.6	%
Japan		181,493		12.4	%		150,150		12.0	%
France		97,638		6.7	%		85,709		6.8	%
Sweden		146,896		10.0	%		98,398		7.8	%
Thailand		107,377		7.3	%		90,878		7.2	%
India		95,484		6.5	%		80,024		6.4	%
South Korea		78,220		5.3	%		75,289		6.0	%
Finland		71,496		4.9	%		74,001		5.9	%
Czech Republic		89,538		6.1	%		80,200		6.4	%
United Kingdom		71,759		4.9	%		64,279		5.1	%
Other		79,923		5.5	%		78,241		6.2	%
	$	1,462,684		100.0	%	$	1,256,213		100.0	%

	Six Months Ended
	February 28, 2021		% of Total Fees for Services Provided to Joint Ventures			February 29, 2020		% of Total Fees for Services Provided to Joint Ventures
Germany	$	460,744		16.5	%	$	420,229		16.1	%
Poland		400,353		14.3	%		365,894		14.0	%
Japan		361,455		12.9	%		314,079		12.0	%
France		203,545		7.3	%		179,340		6.9	%
Sweden		237,385		8.4	%		207,904		8.0	%
Thailand		197,309		7.0	%		193,212		7.4	%
India		183,692		6.6	%		162,984		6.2	%
South Korea		163,298		5.8	%		151,321		5.8	%
Finland		147,779		5.3	%		141,942		5.4	%
Czech Republic		158,891		5.7	%		169,214		6.5	%
United Kingdom		133,674		4.8	%		149,758		5.7	%
Other		151,120		5.4	%		158,661		6.1	%
	$	2,799,245		100.0	%	$	2,614,538		100.0	%