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Note 3 - Inventory (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Inventory, Current [Table Text Block]

		2021				2020
Furnace parts and supplies		$	213,224			$	471,622
Raw materials			2,144,067				1,955,713
Work in process			1,671,290				2,394,481
Finished goods and filtration systems			1,660,907				1,424,171
Reserve for excess and obsolescence			(268,470	)			(723,949	)
Net Inventory		$	5,421,027			$	5,522,038

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.

+ References

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