Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Component parts and other materials	$ 166,350	$ 142,948
Total inventories	2,482,630	1,792,335
Dental Segment [Member]
Finished goods, net	2,090,638	1,315,263
Medical Segment [Member]
Finished goods, net	$ 225,642	$ 334,124

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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