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Note 2 - Inventory (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

		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

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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