Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Component parts and other materials	$ 337,678	$ 331,711
Total inventories	2,020,549	2,420,179
Dental Segment [Member]
Finished goods, net	1,337,117	1,888,141
Medical Segment [Member]
Finished goods, net	$ 345,754	$ 200,327

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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