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v3.23.3

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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