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Note 2 - Inventories - Summary of Inventory (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Furnace parts and supplies	$ 0	$ 55,177
Raw materials	2,734,781	3,301,526
Work in process	2,435,280	1,271,458
Finished goods and filtration systems	1,580,255	1,507,113
Reserve for obsolescence	(1,209,124)	(867,458)
Total inventories, net	$ 5,541,192	$ 5,267,816

X

- Definition

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 after valuation and LIFO reserves of inventory expected to be sold, or consumed 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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