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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Furnace parts and supplies	$ 60,826	$ 66,495
Raw materials	2,846,711	2,474,227
Work in process	1,305,301	982,973
Finished goods and filtration systems	1,242,106	1,201,533
Reserve for excess and obsolescence	(898,944)	(663,227)
Net Inventory	$ 4,556,000	$ 4,062,001

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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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