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Note 5 - Inventories - Summary of Inventory (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Raw materials	$ 3,405,195	$ 2,734,781
Work in process	1,890,956	2,435,280
Finished goods and filtration systems	1,619,526	1,580,255
Reserve for obsolescence	(1,400,788)	(1,209,124)
Total inventories, net	$ 5,514,889	$ 5,541,192

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 of valuation reserve for inventory.

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