Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Product sales, net	$ 1,853,764	$ 2,909,966	$ 4,102,609	$ 5,507,564
Product sales, net	1,853,764	2,909,966	4,102,609	5,507,564
UNITED STATES
Product sales, net	1,364,777	1,420,580
Product sales, net	1,364,777	1,420,580
Domestic [Member]
Product sales, net			2,683,195	2,809,903
Product sales, net			2,683,195	2,809,903
Rest of World [Member]
Product sales, net	488,987	1,219,386	1,419,414	2,427,661
Product sales, net	488,987	1,219,386	1,419,414	2,427,661
CHINA
Product sales, net	0	270,000	0	270,000
Product sales, net	0	270,000	0	270,000
Instruments [Member] | UNITED STATES
Product sales, net	195,676	271,215
Product sales, net	195,676	271,215
Instruments [Member] | Domestic [Member]
Product sales, net			409,551	495,683
Product sales, net			409,551	495,683
Instruments [Member] | Rest of World [Member]
Product sales, net	125,176	474,250	407,262	873,205
Product sales, net	125,176	474,250	407,262	873,205
Instruments [Member] | CHINA
Product sales, net	0	270,000	0	270,000
Product sales, net	0	270,000	0	270,000
Handpieces [Member] | UNITED STATES
Product sales, net	1,154,124	1,127,922
Product sales, net	1,154,124	1,127,922
Handpieces [Member] | Domestic [Member]
Product sales, net			2,241,977	2,269,900
Product sales, net			2,241,977	2,269,900
Handpieces [Member] | Rest of World [Member]
Product sales, net	357,645	732,894	1,004,594	1,526,010
Product sales, net	357,645	732,894	1,004,594	1,526,010
Handpieces [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Accessories [Member] | UNITED STATES
Product sales, net	14,977	21,443
Product sales, net	14,977	21,443
Accessories [Member] | Domestic [Member]
Product sales, net			31,667	44,320
Product sales, net			31,667	44,320
Accessories [Member] | Rest of World [Member]
Product sales, net	6,166	12,242	7,558	28,446
Product sales, net	6,166	12,242	7,558	28,446
Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Dental Segment [Member]
Product sales, net	1,834,764	2,912,166	4,076,189	5,503,564
Product sales, net	1,834,764	2,912,166	4,076,189	5,503,564
Dental Segment [Member] | UNITED STATES
Product sales, net	1,345,777	1,422,780
Product sales, net	1,345,777	1,422,780
Dental Segment [Member] | Domestic [Member]
Product sales, net			2,656,775	2,809,903
Product sales, net			2,656,775	2,809,903
Dental Segment [Member] | Rest of World [Member]
Product sales, net	488,987	1,219,386	1,419,414	2,423,661
Product sales, net	488,987	1,219,386	1,419,414	2,423,661
Dental Segment [Member] | CHINA
Product sales, net	0	270,000	0	270,000
Product sales, net	0	270,000	0	270,000
Dental Segment [Member] | Instruments [Member] | UNITED STATES
Product sales, net	194,676	271,215
Product sales, net	194,676	271,215
Dental Segment [Member] | Instruments [Member] | Domestic [Member]
Product sales, net			408,551	495,683
Product sales, net			408,551	495,683
Dental Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	125,176	474,250	407,262	873,205
Product sales, net	125,176	474,250	407,262	873,205
Dental Segment [Member] | Instruments [Member] | CHINA
Product sales, net	0	270,000	0	270,000
Product sales, net	0	270,000	0	270,000
Dental Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	1,136,124	1,130,122
Product sales, net	1,136,124	1,130,122
Dental Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net			2,216,557	2,269,900
Product sales, net			2,216,557	2,269,900
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	357,645	732,894	1,004,594	1,522,010
Product sales, net	357,645	732,894	1,004,594	1,522,010
Dental Segment [Member] | Handpieces [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Dental Segment [Member] | Accessories [Member] | UNITED STATES
Product sales, net	14,977	21,443
Product sales, net	14,977	21,443
Dental Segment [Member] | Accessories [Member] | Domestic [Member]
Product sales, net			31,667	44,320
Product sales, net			31,667	44,320
Dental Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	6,166	12,242	7,558	28,446
Product sales, net	6,166	12,242	7,558	28,446
Dental Segment [Member] | Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member]
Product sales, net	19,000	(2,200)	26,420	4,000
Product sales, net	19,000	(2,200)	26,420	4,000
Medical Segment [Member] | UNITED STATES
Product sales, net	19,000	(2,200)
Product sales, net	19,000	(2,200)
Medical Segment [Member] | Domestic [Member]
Product sales, net			26,420	0
Product sales, net			26,420	0
Medical Segment [Member] | Rest of World [Member]
Product sales, net	0	0	0	4,000
Product sales, net	0	0	0	4,000
Medical Segment [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member] | Instruments [Member] | UNITED STATES
Product sales, net	1,000	0
Product sales, net	1,000	0
Medical Segment [Member] | Instruments [Member] | Domestic [Member]
Product sales, net			1,000	0
Product sales, net			1,000	0
Medical Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member] | Instruments [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	18,000	(2,200)
Product sales, net	18,000	(2,200)
Medical Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net			25,420	0
Product sales, net			25,420	0
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	0	0	0	4,000
Product sales, net	0	0	0	4,000
Medical Segment [Member] | Handpieces [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member] | Accessories [Member] | UNITED STATES
Product sales, net	0	0
Product sales, net	0	0
Medical Segment [Member] | Accessories [Member] | Domestic [Member]
Product sales, net			0	0
Product sales, net			0	0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	0	0	0	0
Product sales, net	0	0	0	0
Medical Segment [Member] | Accessories [Member] | CHINA
Product sales, net	0	0	0	0
Product sales, net	$ 0	$ 0	$ 0	$ 0