Note M - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Product sales, net	$ 8,374,501	$ 9,622,076
Dental Segment [Member]
Product sales, net	8,336,901	9,502,276
Medical Segment [Member]
Product sales, net	37,600	119,800
Domestic [Member]
Product sales, net	4,526,604	4,831,206
Domestic [Member] | Dental Segment [Member]
Product sales, net	4,512,904	4,798,706
Domestic [Member] | Medical Segment [Member]
Product sales, net	13,700	32,500
Rest of World [Member]
Product sales, net	3,689,247	3,890,870
Rest of World [Member] | Dental Segment [Member]
Product sales, net	3,665,347	3,803,570
Rest of World [Member] | Medical Segment [Member]
Product sales, net	23,900	87,300
CHINA
Product sales, net	158,650	900,000
CHINA | Dental Segment [Member]
Product sales, net	158,650	900,000
CHINA | Medical Segment [Member]
Product sales, net