Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Component parts and other materials	$ 169,630	$ 79,339
Total inventories	1,505,435	1,541,513
Dental Segment [Member]
Finished goods, net	(834,624)	(342,465)
Finished goods, net	834,624	342,465
Medical Segment [Member]
Finished goods, net	(501,181)	(1,119,709)
Finished goods, net	$ 501,181	$ 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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