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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Furnace parts and supplies	$ 405,384	$ 213,224
Raw materials	2,186,304	2,144,067
Work in process	1,648,973	1,671,290
Finished goods and filtration systems	1,831,842	1,660,907
Reserve for obsolescence	(262,901)	(268,470)
Net Inventory	$ 5,809,602	$ 5,421,027

X

- Definition

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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