Note 8 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Product sales, net	$ 2,909,966	$ 1,648,368	$ 5,507,564	$ 4,349,270
Operating Income (Loss)	(2,277,550)	(2,884,879)	(3,620,226)	(4,799,361)
Depreciation and Amortization	16,681	16,645	33,902	33,460
Income (loss) before taxes and equity in earnings of affiliates:	(2,228,828)	(2,881,329)	(3,548,159)	(4,800,554)
Total assets	11,151,452	13,702,086	11,151,452	13,702,086	$ 13,702,086
Dental Segment [Member]
Product sales, net	2,912,166	1,609,768	5,503,564	4,303,120
Medical Segment [Member]
Product sales, net	(2,200)	38,600	4,000	46,150
Operating Segments [Member] | Dental Segment [Member]
Product sales, net	2,912,166	1,609,768	5,503,564	4,303,120
Operating Income (Loss)	598,944	163,022	1,240,884	517,262
Depreciation and Amortization	1,219	893	2,388	1,786
Income (loss) before taxes and equity in earnings of affiliates:	599,126	161,774	1,240,295	514,571
Total assets	4,439,751	3,875,978	4,439,751	3,875,978
Operating Segments [Member] | Medical Segment [Member]
Product sales, net	(2,200)	38,600	4,000	46,150
Operating Income (Loss)	(863,899)	(1,615,283)	(1,685,832)	(2,851,374)
Depreciation and Amortization	694	1,019	1,662	2,037
Income (loss) before taxes and equity in earnings of affiliates:	(865,735)	(1,616,733)	(1,689,503)	(2,854,273)
Total assets	452,974	620,373	452,974	620,373
Corporate, Non-Segment [Member]
Operating Income (Loss)	(2,012,595)	(1,432,618)	(3,175,278)	(2,465,249)
Depreciation and Amortization	14,768	14,733	29,852	29,637
Income (loss) before taxes and equity in earnings of affiliates:	(1,962,219)	(1,426,370)	(3,098,951)	(2,460,852)
Total assets	$ 6,258,727	$ 9,205,735	$ 6,258,727	$ 9,205,735