Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Product sales, net	$ 1,648,368	$ 2,425,738	$ 4,349,270	$ 5,350,445
Operating Income (Loss)	(2,884,879)	(2,872,572)	(4,799,361)	(3,856,945)
Depreciation and Amortization	16,645	14,834	33,460	35,760
Income (loss) before taxes and equity in earnings of affiliates	(2,881,329)	(2,600,853)	(4,800,554)	(3,587,761)
Total assets	16,512,466		16,512,466		$ 19,809,744
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,432,618)	(2,262,369)	(2,465,249)	(3,477,056)
Depreciation and Amortization	14,733	12,809	29,637	28,178
Income (loss) before taxes and equity in earnings of affiliates	(1,426,370)	(2,062,748)	(2,460,852)	(3,277,785)
Total assets	10,746,305		10,746,305		12,273,064
Dental Segment [Member]
Product sales, net	1,609,768	2,404,738	4,303,120	5,258,395
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	1,609,768	2,404,738	4,303,120	5,258,395
Operating Income (Loss)	163,022	524,798	517,262	1,650,831
Depreciation and Amortization	893	860	1,786	2,566
Income (loss) before taxes and equity in earnings of affiliates	161,774	598,166	514,571	1,723,284
Total assets	4,947,626		4,947,626		6,163,169
Medical Segment [Member]
Product sales, net	38,600	21,000	46,150	92,050
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	38,600	21,000	46,150	92,050
Operating Income (Loss)	(1,615,283)	(1,135,001)	(2,851,374)	(2,030,720)
Depreciation and Amortization	1,019	1,165	2,037	5,016
Income (loss) before taxes and equity in earnings of affiliates	(1,616,733)	$ (1,136,271)	(2,854,273)	$ (2,033,260)
Total assets	$ 818,535		$ 818,535		$ 1,373,511