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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Furnace parts and supplies	$ 213,224	$ 471,622
Raw materials	2,144,067	1,955,713
Work in process	1,671,290	2,394,481
Finished goods and filtration systems	1,660,907	1,424,171
Reserve for excess and obsolescence	(268,470)	(723,949)
Net Inventory	$ 5,421,027	$ 5,522,038

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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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