Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Product sales, net	$ 2,700,902	$ 2,924,707
Operating Income (Loss)	(1,914,483)	(984,373)
Depreciation and Amortization	16,814	20,924
Income (loss) before taxes and equity in earnings of affiliates	(1,919,225)	(986,908)
Total assets	19,065,176		$ 19,809,744
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,032,632)	(1,214,661)
Depreciation and Amortization	14,902	15,367
Income (loss) before taxes and equity in earnings of affiliates	(1,034,482)	(1,215,011)
Total assets	12,012,948		12,273,064
Dental Segment [Member]
Product sales, net	2,693,352	2,853,657
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	2,693,352	2,853,657
Operating Income (Loss)	354,240	1,126,069
Depreciation and Amortization	893	1,706
Income (loss) before taxes and equity in earnings of affiliates	352,797	1,125,154
Total assets	5,750,344		6,163,169
Medical Segment [Member]
Product sales, net	7,550	71,050
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	7,550	71,050
Operating Income (Loss)	(1,236,091)	(895,781)
Depreciation and Amortization	1,019	3,851
Income (loss) before taxes and equity in earnings of affiliates	(1,237,540)	$ (897,051)
Total assets	$ 1,301,884		$ 1,373,511