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Note 4 - Inventory - Summary of Inventory (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Furnace parts and supplies | $ 609,550 | $ 213,224
Raw materials | 2,157,268 | 2,144,067
Work in process | 936,059 | 1,671,290
Finished goods and filtration systems | 1,532,387 | 1,660,907
Reserve for obsolescence | (578,076) | (268,470)
Net Inventory | $ 4,657,188 | $ 5,421,027

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