Note 10 - Segment and Geographic Data - Summary by Reporting and Operating Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Product sales, net	$ 1,811,386	$ 1,915,909
Operating Income (Loss)	(1,608,606)	(818,181)
Depreciation and Amortization	37,219	26,045
Income (loss) before taxes and equity in earnings of affiliates	(1,612,703)	(779,166)
Dental	6,374,601		$ 6,556,289
Total assets	6,374,601		6,556,289
Corporate, Non-Segment [Member]
Operating Income (Loss)	(1,515,178)	(818,464)
Depreciation and Amortization	27,808	19,512
Income (loss) before taxes and equity in earnings of affiliates	(1,515,178)	(779,765)
Dental	1,774,678		957,238
Total assets	1,774,678		957,238
Dental Segment [Member]
Product sales, net	1,803,586	1,915,509
Dental Segment [Member] | Operating Segments [Member]
Product sales, net	1,803,586	1,915,509
Operating Income (Loss)	576,386	491,966
Depreciation and Amortization	5,699	3,936
Income (loss) before taxes and equity in earnings of affiliates	572,289	492,985
Dental	4,017,592		5,008,324
Total assets	4,017,592		5,008,324
Medical Segment [Member]
Product sales, net	7,800	400
Medical Segment [Member] | Operating Segments [Member]
Product sales, net	7,800	400
Operating Income (Loss)	(669,814)	(491,683)
Depreciation and Amortization	3,712	2,597
Income (loss) before taxes and equity in earnings of affiliates	(669,814)	$ (492,386)
Dental	582,331		590,727
Total assets	$ 582,331		$ 590,727