Note 8 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Product sales, net	$ 2,597,598	$ 2,700,902
Operating Income (Loss)	(1,342,676)	(1,914,483)
Depreciation and Amortization	17,220	16,814
Income (loss) before taxes and equity in earnings of affiliates:	(1,319,331)	(1,919,225)
Total assets	12,273,353		$ 13,702,086
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,162,683)	(1,032,632)
Depreciation and Amortization	15,084	14,902
Income (loss) before taxes and equity in earnings of affiliates:	(1,136,732)	(1,034,482)
Total assets	7,529,837		9,205,735
Dental Segment [Member]
Product sales, net	2,591,398	2,693,352
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	2,591,398	2,693,352
Operating Income (Loss)	641,940	354,240
Depreciation and Amortization	1,168	893
Income (loss) before taxes and equity in earnings of affiliates:	641,169	352,797
Total assets	4,051,796		3,875,978
Medical Segment [Member]
Product sales, net	6,200	7,550
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	6,200	7,550
Operating Income (Loss)	(821,933)	(1,236,091)
Depreciation and Amortization	968	1,019
Income (loss) before taxes and equity in earnings of affiliates:	(823,768)	$ (1,237,540)
Total assets	$ 691,720		$ 620,373