Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Product sales, net	$ 2,597,598	$ 2,700,902
Dental Segment [Member]
Product sales, net	2,591,398	2,693,352
Medical Segment [Member]
Product sales, net	6,200	7,550
Domestic [Member]
Product sales, net	1,389,323	951,237
Domestic [Member] | Instruments [Member]
Product sales, net	225,274	122,968
Domestic [Member] | Handpieces [Member]
Product sales, net	1,140,978	803,409
Domestic [Member] | Accessories [Member]
Product sales, net	23,071	24,860
Domestic [Member] | Dental Segment [Member]
Product sales, net	1,387,123	943,687
Domestic [Member] | Dental Segment [Member] | Instruments [Member]
Product sales, net		122,968
Domestic [Member] | Dental Segment [Member] | Handpieces [Member]
Product sales, net	1,139,778	795,859
Domestic [Member] | Dental Segment [Member] | Accessories [Member]
Product sales, net	23,071	24,860
Domestic [Member] | Medical Segment [Member]
Product sales, net	2,200	7,550
Domestic [Member] | Medical Segment [Member] | Instruments [Member]
Product sales, net	1,000	0
Domestic [Member] | Medical Segment [Member] | Handpieces [Member]
Product sales, net	1,200	7,550
Domestic [Member] | Medical Segment [Member] | Accessories [Member]
Product sales, net	0	0
Rest of World [Member]
Product sales, net	1,208,275	1,389,701
Rest of World [Member] | Instruments [Member]
Product sales, net	398,955	453,560
Rest of World [Member] | Handpieces [Member]
Product sales, net	793,116	923,952
Rest of World [Member] | Accessories [Member]
Product sales, net	16,204	12,189
Rest of World [Member] | Dental Segment [Member]
Product sales, net	1,204,275	1,389,701
Rest of World [Member] | Dental Segment [Member] | Instruments [Member]
Product sales, net	398,955	453,560
Rest of World [Member] | Dental Segment [Member] | Handpieces [Member]
Product sales, net	789,116	923,952
Rest of World [Member] | Dental Segment [Member] | Accessories [Member]
Product sales, net	16,204	12,189
Rest of World [Member] | Medical Segment [Member]
Product sales, net	4,000	0
Rest of World [Member] | Medical Segment [Member] | Instruments [Member]
Product sales, net	0	0
Rest of World [Member] | Medical Segment [Member] | Handpieces [Member]
Product sales, net	4,000	0
Rest of World [Member] | Medical Segment [Member] | Accessories [Member]
Product sales, net	0
CHINA
Product sales, net	0	359,964
CHINA | Instruments [Member]
Product sales, net	0	0
CHINA | Handpieces [Member]
Product sales, net	0	359,964
CHINA | Accessories [Member]
Product sales, net	0	0
CHINA | Dental Segment [Member]
Product sales, net	0	359,964
CHINA | Dental Segment [Member] | Instruments [Member]
Product sales, net	0	0
CHINA | Dental Segment [Member] | Handpieces [Member]
Product sales, net	0	359,964
CHINA | Dental Segment [Member] | Accessories [Member]
Product sales, net	0	0
CHINA | Medical Segment [Member]
Product sales, net	0	0
CHINA | Medical Segment [Member] | Instruments [Member]
Product sales, net	0	0
CHINA | Medical Segment [Member] | Handpieces [Member]
Product sales, net	0	0
CHINA | Medical Segment [Member] | Accessories [Member]
Product sales, net	$ 0	$ 0