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Note 12 - Segment and Geographic Information (Tables)

12 Months Ended

Aug. 31, 2025

Notes Tables

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

		Fiscal 2025				Fiscal 2024
ZERUST® net sales		$	62,488,397			$	63,092,575
Natur-Tec® net sales			21,746,077				21,966,942
Total net sales		$	84,234,474			$	85,059,517

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

		Fiscal 2025				Fiscal 2024
Direct cost of goods sold
ZERUST®		$	35,535,306			$	33,623,834
Natur-Tec®			13,994,302				14,148,145
Indirect cost of goods sold			3,028,311				3,501,176
Total net cost of goods sold		$	52,557,919			$	51,273,155

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Fiscal 2025				Fiscal 2024
ZERUST® gross profit		$	26,953,091			$	29,468,741
Natur-Tec® gross profit			7,751,775				7,818,797
Total segment gross profit			34,704,866				37,287,538
Indirect cost of goods sold			(3,028,311	)			(3,501,176	)
Total gross profit		$	31,676,555			$	33,786,362
Total joint venture operations			8,545,207				9,475,078
Selling expenses			(17,820,196	)			(16,413,672	)
General and administrative expenses			(14,792,988	)			(14,176,494	)
Research and development expenses			(5,038,281	)			(4,802,791	)
Interest income			308,054				118,827
Interest expense			(599,927	)			(340,129	)
Other income			752,971				—
Income before income tax expense		$	3,031,395			$	7,647,181

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

		Fiscal Year Ended August 31,
		2025				2024
Inside the U.S. to unaffiliated customers		$	29,547,889			$	30,492,665
Outside the U.S. to:
Joint ventures in which the Company is a shareholder directly and indirectly			2,368,099				2,228,894
Unaffiliated customers			52,318,486				52,337,958
		$	84,234,474			$	85,059,517

		Fiscal 2025				% of Total Fees for Services Provided to Joint Ventures				Fiscal 2024				% of Total Fees for Services Provided to Joint Ventures
Germany		$	846,281				16.9	%		$	828,932				15.8	%
Poland			840,467				16.8	%			849,736				16.2	%
Japan			647,573				12.9	%			582,674				11.1	%
Finland			411,268				8.2	%			395,515				7.5	%
United Kingdom			404,342				8.1	%			375,150				7.1	%
Thailand			371,175				7.4	%			332,148				6.3	%
Sweden			330,205				6.6	%			445,560				8.5	%
France			320,546				6.4	%			485,627				9.2	%
Czech Republic			303,869				6.1	%			338,195				6.4	%
South Korea			186,669				3.7	%			258,314				4.9	%
Indonesia			137,125				2.7	%			166,053				3.2	%
Other			206,631				4.2	%			193,877				3.7	%
		$	5,006,151				100.0	%		$	5,251,782				100.0	%

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

		At August 31, 2025				At August 31, 2024
China		$	5,355,918			$	5,627,202
Other			1,296,988				1,217,400
United States			8,531,012				9,421,051
Total property and equipment		$	15,183,918			$	16,265,653

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

		Fiscal Year Ended August 31, 2025				Fiscal Year Ended August 31, 2024
China		$	16,239,889			$	14,245,238
Brazil			6,570,850				5,994,372
India			22,620,639				22,189,317
Other			9,255,207				12,137,925
United States			29,547,889				30,492,665
Total net sales		$	84,234,474			$	85,059,517

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