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Note 3 - Inventory - Summary of Inventory (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Furnace parts and supplies	$ 62,468	$ 66,495
Raw materials	2,802,318	2,474,227
Work in process	1,153,817	982,973
Finished goods and filtration systems	1,137,315	1,201,533
Reserve for obsolescence	(732,638)	(663,227)
Net Inventory	$ 4,423,280	$ 4,062,001

X

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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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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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