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Note 5 - Inventories - Summary of Inventory (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Furnace parts and supplies	$ 23,950	$ 55,177
Raw materials	3,272,852	3,301,526
Work in process	2,397,553	1,271,458
Finished goods and filtration systems	1,699,003	1,507,113
Reserve for obsolescence	(1,129,745)	(867,458)
Total inventories, net	$ 6,263,613	$ 5,267,816

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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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