Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Component parts and other materials	$ 178,648	$ 79,339
Total inventories	1,799,908	1,541,513
Dental Segment [Member]
Finished goods, net	(632,003)	(342,465)
Finished goods, net	632,003	342,465
Medical Segment [Member]
Finished goods, net	(989,257)	(1,119,709)
Finished goods, net	$ 989,257	$ 1,119,709

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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