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Note 4 - Inventory - Summary of Inventory (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Furnace parts and supplies	$ 477,599	$ 213,224
Raw materials	2,292,852	2,144,067
Work in process	1,080,722	1,671,290
Finished goods and filtration systems	2,014,225	1,660,907
Reserve for obsolescence	(419,985)	(268,470)
Net Inventory	$ 5,445,413	$ 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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