Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Product sales, net	$ 2,248,845	$ 2,597,598
UNITED STATES
Product sales, net	1,316,998	1,389,323
Rest of World [Member]
Product sales, net	931,847	1,208,275
Instruments [Member] | UNITED STATES
Product sales, net	213,875	225,274
Instruments [Member] | Rest of World [Member]
Product sales, net	282,087	398,955
Handpieces [Member] | UNITED STATES
Product sales, net	1,086,433	1,140,978
Handpieces [Member] | Rest of World [Member]
Product sales, net	648,368	793,116
Accessories [Member] | UNITED STATES
Product sales, net	16,690	23,071
Accessories [Member] | Rest of World [Member]
Product sales, net	1,392	16,204
Dental Segment [Member]
Product sales, net	2,241,425	2,591,398
Dental Segment [Member] | UNITED STATES
Product sales, net	1,310,998	1,387,123
Dental Segment [Member] | Rest of World [Member]
Product sales, net	930,427	1,204,275
Dental Segment [Member] | Instruments [Member] | UNITED STATES
Product sales, net	213,875	224,274
Dental Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	282,087	398,955
Dental Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	1,080,433	1,139,778
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	646,948	789,116
Dental Segment [Member] | Accessories [Member] | UNITED STATES
Product sales, net	16,690	23,071
Dental Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	1,392	16,204
Medical Segment [Member]
Product sales, net	7,420	6,200
Medical Segment [Member] | UNITED STATES
Product sales, net	6,000	2,200
Medical Segment [Member] | Rest of World [Member]
Product sales, net	1,420	4,000
Medical Segment [Member] | Instruments [Member] | UNITED STATES
Product sales, net	0	1,000
Medical Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	0	0
Medical Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	6,000	1,200
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	1,420	4,000
Medical Segment [Member] | Accessories [Member] | UNITED STATES
Product sales, net	0	0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	$ 0	$ 0