Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Component parts and other materials	$ 170,322		$ 142,948
Total inventories	2,038,298	$ 1,792,335	1,792,335
Dental Segment [Member]
Finished goods, net	1,541,290		1,315,263
Medical Segment [Member]
Finished goods, net	$ 326,686		$ 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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