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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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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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