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Note 3 - Inventory (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedule of Inventory, Current [Table Text Block]

		March 31, 2023				December 31, 2022
Furnace parts and supplies		$	67,689			$	66,495
Raw materials			2,721,031				2,474,227
Work in process			1,155,789				982,973
Finished goods and filtration systems			1,152,376				1,201,533
Reserve for obsolescence			(675,137	)			(663,227	)
Net Inventory		$	4,421,748			$	4,062,001

X

- Definition

Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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