Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Product sales, net	$ 2,909,966	$ 1,648,368	$ 5,507,564	$ 4,349,270
CHINA
Product sales, net	270,000	0	270,000	359,964
Domestic [Member]
Product sales, net	1,420,580	997,782	2,809,903	1,949,019
Rest of World [Member]
Product sales, net	1,219,386	650,586	2,427,661	2,040,287
Instruments [Member] | CHINA
Product sales, net	270,000	0	270,000	0
Instruments [Member] | Domestic [Member]
Product sales, net	271,215	155,028	495,683	277,996
Instruments [Member] | Rest of World [Member]
Product sales, net	474,250	160,814	873,205	614,374
Handpieces [Member] | CHINA
Product sales, net	0	0	0	359,964
Handpieces [Member] | Domestic [Member]
Product sales, net	1,127,922	820,133	2,269,900	1,623,542
Handpieces [Member] | Rest of World [Member]
Product sales, net	732,894	479,799	1,526,010	1,403,751
Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Accessories [Member] | Domestic [Member]
Product sales, net	21,443	22,621	44,320	47,481
Accessories [Member] | Rest of World [Member]
Product sales, net	12,242	9,973	28,446	22,162
Dental Segment [Member]
Product sales, net	2,912,166	1,609,768	5,503,564	4,303,120
Dental Segment [Member] | CHINA
Product sales, net	270,000	0	270,000	359,964
Dental Segment [Member] | Domestic [Member]
Product sales, net	1,422,780	979,182	2,809,903	1,922,869
Dental Segment [Member] | Rest of World [Member]
Product sales, net	1,219,386	630,586	2,423,661	2,020,287
Dental Segment [Member] | Instruments [Member] | CHINA
Product sales, net	270,000	0	270,000	0
Dental Segment [Member] | Instruments [Member] | Domestic [Member]
Product sales, net	271,215	155,028	495,683	277,996
Dental Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	474,250	160,814	873,205	614,374
Dental Segment [Member] | Handpieces [Member] | CHINA
Product sales, net	0	0	0	359,964
Dental Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net	1,130,122	801,533	2,269,900	1,597,392
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	732,894	459,799	1,522,010	1,383,751
Dental Segment [Member] | Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Dental Segment [Member] | Accessories [Member] | Domestic [Member]
Product sales, net	21,443	22,621	44,320	47,481
Dental Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	12,242	9,973	28,446	22,162
Medical Segment [Member]
Product sales, net	(2,200)	38,600	4,000	46,150
Medical Segment [Member] | CHINA
Product sales, net	0	0	0	0
Medical Segment [Member] | Domestic [Member]
Product sales, net	(2,200)	18,600	0	26,150
Medical Segment [Member] | Rest of World [Member]
Product sales, net	0	20,000	4,000	20,000
Medical Segment [Member] | Instruments [Member] | CHINA
Product sales, net	0	0	0	0
Medical Segment [Member] | Instruments [Member] | Domestic [Member]
Product sales, net	0	0	0	0
Medical Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	0	0	0	0
Medical Segment [Member] | Handpieces [Member] | CHINA
Product sales, net	0	0	0	0
Medical Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net	(2,200)	18,600	0	26,150
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	0	20,000	4,000	20,000
Medical Segment [Member] | Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Medical Segment [Member] | Accessories [Member] | Domestic [Member]
Product sales, net	0	0	0	0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	$ 0	$ 0	$ 0	$ 0