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Note 1 - Organization and Summary of Significant Accounting Policies - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue, Percentage	100.00%	100.00%
Revenue	$ 14,604,618	$ 18,001,652
Water Segment [Member]
Revenue, Percentage	38.00%	42.00%
Revenue	$ 5,538,741	$ 7,705,080
Ceramics Segment [Member]
Revenue, Percentage	39.00%	35.00%
Revenue	$ 5,634,973	$ 6,232,628
Plastics Segment [Member]
Revenue, Percentage	23.00%	21.00%
Revenue	$ 3,381,408	$ 3,736,529
Corporate Segment [Member]
Revenue, Percentage	0.00%	2.00%
Revenue	$ 49,496	$ 327,415

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