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Note 2 - Inventory - Summary of Inventory (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 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

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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