Note 11 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Product sales, net	$ 2,108,233	$ 1,246,110	$ 7,458,678	$ 3,225,170
Operating Income (Loss)	(1,980,921)	(1,476,728)	(5,837,866)	(6,258,225)
Depreciation and Amortization	16,353	16,505	52,113	74,861
Income (loss) before taxes and equity in earnings of affiliates	(1,985,529)	(1,477,297)	(5,573,290)	(6,266,952)
Total assets	20,077,487		20,077,487		$ 19,571,450
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,236,297)	(855,123)	(4,713,353)	(3,928,521)
Depreciation and Amortization	14,220	15,429	42,398	60,653
Income (loss) before taxes and equity in earnings of affiliates	(1,238,191)	(853,834)	(4,515,976)	(3,931,333)
Total assets	12,660,726		12,660,726		12,612,147
Dental Segment [Member]
Product sales, net	2,076,233	1,240,110	7,334,628	3,209,370
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	2,076,233	1,240,110	7,334,628	3,209,370
Operating Income (Loss)	193,252	191,235	1,844,083	(32,624)
Depreciation and Amortization	892	402	3,458	9,202
Income (loss) before taxes and equity in earnings of affiliates	191,864	190,472	1,915,148	(35,376)
Total assets	6,047,663		6,047,663		6,035,645
Medical Segment [Member]
Product sales, net	32,000	6,000	124,050	15,800
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	32,000	6,000	124,050	15,800
Operating Income (Loss)	(937,876)	(812,840)	(2,968,596)	(2,297,080)
Depreciation and Amortization	1,241	674	6,257	5,006
Income (loss) before taxes and equity in earnings of affiliates	(939,202)	$ (813,935)	(2,972,462)	$ (2,300,243)
Total assets	$ 1,369,098		$ 1,369,098		$ 923,658