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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Furnace parts and supplies	$ 67,689	$ 66,495
Raw materials	2,721,031	2,474,227
Work in process	1,155,789	982,973
Finished goods and filtration systems	1,152,376	1,201,533
Reserve for obsolescence	(675,137)	(663,227)
Net Inventory	$ 4,421,748	$ 4,062,001

X

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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