Note 8 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Product sales, net	$ 1,853,764	$ 2,909,966	$ 4,102,609	$ 5,507,564
Operating Income (Loss)	(1,780,423)	(2,277,550)	(3,245,491)	(3,620,226)
Depreciation and Amortization	8,477	16,681	20,161	33,902
Income (loss) before taxes and equity in earnings of affiliates	223,638	(2,228,828)	(1,216,891)	(3,548,159)
Total income (loss) before taxes and equity in earnings of affiliates	223,638	(2,228,828)	(1,216,891)	(3,548,159)
Total assets	12,005,240	11,371,512	12,005,240	11,371,512	$ 11,371,512
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating Income (Loss)	(1,445,351)	(2,012,595)	(3,044,501)	(3,175,278)
Depreciation and Amortization	8,477	14,768	20,161	29,852
Income (loss) before taxes and equity in earnings of affiliates	558,463	(1,962,219)	(1,014,645)	(3,098,951)
Total income (loss) before taxes and equity in earnings of affiliates	558,463	(1,962,219)	(1,014,645)	(3,098,951)
Total assets	6,421,173	6,159,532	6,421,173	6,159,532
Dental Segment [Member]
Product sales, net	1,834,764	2,912,166	4,076,189	5,503,564
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	1,834,764	2,912,166	4,076,189	5,503,564
Operating Income (Loss)	193,243	598,944	818,750	1,240,884
Depreciation and Amortization	0	1,219	0	2,388
Income (loss) before taxes and equity in earnings of affiliates	193,266	599,126	817,776	1,240,295
Total income (loss) before taxes and equity in earnings of affiliates	193,266	599,126	817,776	1,240,295
Total assets	5,132,387	4,866,786	5,132,387	4,866,786
Medical Segment [Member]
Product sales, net	19,000	(2,200)	26,420	4,000
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	19,000	(2,200)	26,420	4,000
Operating Income (Loss)	(528,315)	(863,899)	(1,019,740)	(1,685,832)
Depreciation and Amortization	0	694	0	1,662
Income (loss) before taxes and equity in earnings of affiliates	(528,091)	(865,735)	(1,020,022)	(1,689,503)
Total income (loss) before taxes and equity in earnings of affiliates	(528,091)	(865,735)	(1,020,022)	(1,689,503)
Total assets	$ 451,680	$ 345,194	$ 451,680	$ 345,194