Note 11 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Product sales, net	$ 167,674	$ 2,257,851	$ 1,979,060	$ 4,173,759
Operating Income (Loss)	(3,172,890)	(1,107,831)	(4,781,496)	(1,926,015)
Depreciation and Amortization	21,138	25,456	58,357	51,501
Income (loss) before taxes and equity in earnings of affiliates	(3,176,952)	(1,097,744)	(4,789,655)	(1,876,911)
Total assets	20,963,688		20,963,688		$ 6,556,289
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,708,225)	(1,072,647)	(3,073,399)	(1,891,114)
Depreciation and Amortization	17,416	15,507	45,224	31,445
Income (loss) before taxes and equity in earnings of affiliates	(1,710,177)	(1,060,788)	(3,077,500)	(1,840,553)
Total assets	17,077,884		17,077,884		957,238
Dental Segment [Member]
Product sales, net	165,674	2,242,751	1,969,260	4,158,260
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	165,674	2,242,751	1,969,260	4,158,259
Operating Income (Loss)	(650,236)	629,474	(223,856)	1,121,440
Depreciation and Amortization	3,101	3,950	8,800	7,886
Income (loss) before taxes and equity in earnings of affiliates	(651,384)	627,051	(225,845)	1,120,035
Total assets	3,206,689		3,206,689		5,008,324
Medical Segment [Member]
Product sales, net	2,000	15,100	9,800	15,500
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	2,000	15,100	9,800	15,550
Operating Income (Loss)	(814,429)	(664,658)	(1,484,241)	(1,156,341)
Depreciation and Amortization	621	5,999	4,333	12,170
Income (loss) before taxes and equity in earnings of affiliates	(815,391)	$ (664,007)	(1,486,310)	$ (1,156,393)
Total assets	$ 679,115		$ 679,115		$ 590,727