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Note 3 - Inventory

3 Months Ended

Mar. 31, 2023

Notes to Financial Statements

Inventory Disclosure [Text Block]

NOTE 3 - INVENTORY

Inventory consisted of the following on March 31, 2023, and December 31, 2022:

		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

Inventory valuation adjustments for excess and obsolete inventory are calculated based on current inventory levels, movements, expected useful lives, and estimated future demand for the products.

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- Definition

The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//330/tableOfContent

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