Note 2 - Inventory

3 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Inventory Disclosure [Text Block]

NOTE

2

- INVENTORY

Inventory consisted of the following at

March 31, 2019

and

December 31, 2018:

	201 9			201 8
Furnace parts and supplies	$	654,278		$	596,806
Raw materials		1,605,809			1,659,826
Work in process		1,581,128			1,691,175
Finished goods and filtration systems		1,401,445			1,596,042
Reserve for obsolescence		(945,945	)		(1,111,794	)
Net Inventory	$	4,296,715		$	4,432,055