Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Component parts and other materials	$ 92,859	$ 99,885
Total inventories	1,722,825	1,620,509
Dental Segment [Member]
Finished goods, net	1,408,967	1,306,763
Medical Segment [Member]
Finished goods, net	$ 220,999	$ 213,861

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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