Note 11 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Product sales, net	$ 2,924,707	$ 1,811,386
Operating Income (Loss)	(984,373)	(1,608,606)
Depreciation and Amortization	20,924	37,219
Income (loss) before taxes and equity in earnings of affiliates	(986,908)	(1,612,703)
Total assets	22,641,033		$ 19,571,450
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,214,661)	(1,515,178)
Depreciation and Amortization	15,367	27,808
Income (loss) before taxes and equity in earnings of affiliates	(1,215,011)	(1,515,178)
Total assets	14,667,467		12,612,147
Dental Segment [Member]
Product sales, net	2,856,658	1,803,586
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	2,853,657	1,803,586
Operating Income (Loss)	1,126,069	576,386
Depreciation and Amortization	1,706	5,699
Income (loss) before taxes and equity in earnings of affiliates	1,125,154	572,289
Total assets	6,954,380		6,035,645
Medical Segment [Member]
Product sales, net	71,050	7,800
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	71,050	7,800
Operating Income (Loss)	(895,781)	(669,814)
Depreciation and Amortization	3,851	3,712
Income (loss) before taxes and equity in earnings of affiliates	(897,051)	$ (669,814)
Total assets	$ 1,019,186		$ 923,658