Note M - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Product sales, net	$ 8,805,906	$ 10,304,711
Dental Segment [Member]
Product sales, net	8,753,156	10,152,511
Medical Segment [Member]
Product sales, net	52,750	152,200
Domestic [Member]
Product sales, net	3,289,872	3,571,549
Domestic [Member] | Dental Segment [Member]
Product sales, net	3,257,122	3,535,049
Domestic [Member] | Medical Segment [Member]
Product sales, net	32,750	36,500
Rest of World [Member]
Product sales, net	4,886,070	4,635,034
Rest of World [Member] | Dental Segment [Member]
Product sales, net	4,866,070	4,519,334
Rest of World [Member] | Medical Segment [Member]
Product sales, net	20,000	115,700
CHINA
Product sales, net	629,964	2,098,128
CHINA | Dental Segment [Member]
Product sales, net	629,964	2,098,128
CHINA | Medical Segment [Member]
Product sales, net	0	0
Instruments [Member] | Domestic [Member]
Product sales, net	532,215	560,424
Instruments [Member] | Domestic [Member] | Dental Segment [Member]
Product sales, net	524,715	560,424
Instruments [Member] | Domestic [Member] | Medical Segment [Member]
Product sales, net	7,500	0
Instruments [Member] | Rest of World [Member]
Product sales, net	1,413,525	1,296,486
Instruments [Member] | Rest of World [Member] | Dental Segment [Member]
Product sales, net	1,413,525	1,226,486
Instruments [Member] | Rest of World [Member] | Medical Segment [Member]
Product sales, net	0	70,000
Instruments [Member] | CHINA
Product sales, net	270,000	303,000
Instruments [Member] | CHINA | Dental Segment [Member]
Product sales, net	270,000	303,000
Instruments [Member] | CHINA | Medical Segment [Member]
Product sales, net	0	0
Handpieces [Member] | Domestic [Member]
Product sales, net	2,679,164	2,940,554
Handpieces [Member] | Domestic [Member] | Dental Segment [Member]
Product sales, net	2,653,914	2,905,354
Handpieces [Member] | Domestic [Member] | Medical Segment [Member]
Product sales, net	25,250	35,200
Handpieces [Member] | Rest of World [Member]
Product sales, net	3,411,748	3,291,202
Handpieces [Member] | Rest of World [Member] | Dental Segment [Member]
Product sales, net	3,391,748	3,246,302
Handpieces [Member] | Rest of World [Member] | Medical Segment [Member]
Product sales, net	20,000	44,900
Handpieces [Member] | CHINA
Product sales, net	359,964	1,795,128
Handpieces [Member] | CHINA | Dental Segment [Member]
Product sales, net	359,964	1,795,128
Handpieces [Member] | CHINA | Medical Segment [Member]
Product sales, net	0	0
Accessories [Member] | Domestic [Member]
Product sales, net	78,493	70,571
Accessories [Member] | Domestic [Member] | Dental Segment [Member]
Product sales, net	78,493	69,271
Accessories [Member] | Domestic [Member] | Medical Segment [Member]
Product sales, net	0	1,300
Accessories [Member] | Rest of World [Member]
Product sales, net	60,797	47,346
Accessories [Member] | Rest of World [Member] | Dental Segment [Member]
Product sales, net	60,797	46,546
Accessories [Member] | Rest of World [Member] | Medical Segment [Member]
Product sales, net	0	800
Accessories [Member] | CHINA
Product sales, net	0	0
Accessories [Member] | CHINA | Dental Segment [Member]
Product sales, net	0	0
Accessories [Member] | CHINA | Medical Segment [Member]
Product sales, net	$ 0	$ 0