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Note 2 - Inventory

12 Months Ended

Dec. 31, 2020

Notes to Financial Statements

Inventory Disclosure [Text Block]

NOTE 2 - INVENTORY

Inventory consisted of the following at December 31, 2020 and December 31, 2019:

		2020				2019
Furnace parts and supplies		$	471,622			$	621,991
Raw materials			1,955,713				2,125,921
Work in process			2,394,481				1,624,499
Finished goods and filtration systems			1,424,171				1,492,135
Reserve for excess and obsolescence			(723,949	)			(665,308	)
Net Inventory		$	5,522,038			$	5,199,238

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-URI http://asc.fasb.org/topic&trid=2126998

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