Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Product sales, net	$ 2,513,805	$ 2,059,284	$ 6,616,414	$ 7,566,848
Product sales, net	2,513,805	2,059,284	6,616,414	7,566,848
UNITED STATES
Product sales, net	1,226,716	1,253,367
Product sales, net	1,226,716	1,253,367
Domestic [Member]
Product sales, net			3,908,491	4,063,270
Product sales, net			3,908,491	4,063,270
Rest of World [Member]
Product sales, net	1,287,089	805,917	2,707,923	3,233,578
Product sales, net	1,287,089	805,917	2,707,923	3,233,578
CHINA
Product sales, net			0	270,000
Product sales, net			0	270,000
Instruments [Member] | UNITED STATES
Product sales, net	180,699	230,615
Product sales, net	180,699	230,615
Instruments [Member] | Domestic [Member]
Product sales, net			590,250	726,104
Product sales, net			590,250	726,104
Instruments [Member] | Rest of World [Member]
Product sales, net	293,966	88,019	701,228	961,224
Product sales, net	293,966	88,019	701,228	961,224
Instruments [Member] | CHINA
Product sales, net			0	270,000
Product sales, net			0	270,000
Handpieces [Member] | UNITED STATES
Product sales, net	1,040,516	1,007,930
Product sales, net	1,040,516	1,007,930
Handpieces [Member] | Domestic [Member]
Product sales, net			3,281,073	3,277,830
Product sales, net			3,281,073	3,277,830
Handpieces [Member] | Rest of World [Member]
Product sales, net	963,589	706,697	1,969,603	2,232,707
Product sales, net	963,589	706,697	1,969,603	2,232,707
Handpieces [Member] | CHINA
Product sales, net			0	0
Product sales, net			0	0
Accessories [Member] | UNITED STATES
Product sales, net	5,501	14,822
Product sales, net	5,501	14,822
Accessories [Member] | Domestic [Member]
Product sales, net			37,168	59,336
Product sales, net			37,168	59,336
Accessories [Member] | Rest of World [Member]
Product sales, net	29,534	11,201	37,092	39,647
Product sales, net	29,534	11,201	37,092	39,647
Accessories [Member] | CHINA
Product sales, net			0	0
Product sales, net			0	0
Dental Segment [Member]
Product sales, net	2,466,405	2,053,284	6,542,594	7,556,848
Product sales, net	2,466,405	2,053,284	6,542,594	7,556,848
Dental Segment [Member] | UNITED STATES
Product sales, net	1,214,316	1,253,367
Product sales, net	1,214,316	1,253,367
Dental Segment [Member] | Domestic [Member]
Product sales, net			3,871,091	4,063,270
Product sales, net			3,871,091	4,063,270
Dental Segment [Member] | Rest of World [Member]
Product sales, net	1,252,089	799,917	2,671,503	3,223,578
Product sales, net	1,252,089	799,917	2,671,503	3,223,578
Dental Segment [Member] | CHINA
Product sales, net			0	270,000
Product sales, net			0	270,000
Dental Segment [Member] | Instruments [Member] | UNITED STATES
Product sales, net	179,699	230,615
Product sales, net	179,699	230,615
Dental Segment [Member] | Instruments [Member] | Domestic [Member]
Product sales, net			588,250	726,104
Product sales, net			588,250	726,104
Dental Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	261,466	88,019	668,728	961,224
Product sales, net	261,466	88,019	668,728	961,224
Dental Segment [Member] | Instruments [Member] | CHINA
Product sales, net			0	270,000
Product sales, net			0	270,000
Dental Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	1,029,116	1,007,930
Product sales, net	1,029,116	1,007,930
Dental Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net			3,245,673	3,277,830
Product sales, net			3,245,673	3,277,830
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	961,089	700,697	1,965,683	2,222,707
Product sales, net	961,089	700,697	1,965,683	2,222,707
Dental Segment [Member] | Handpieces [Member] | CHINA
Product sales, net			0	0
Product sales, net			0	0
Dental Segment [Member] | Accessories [Member] | UNITED STATES
Product sales, net	5,501	14,822
Product sales, net	5,501	14,822
Dental Segment [Member] | Accessories [Member] | Domestic [Member]
Product sales, net			37,168	59,336
Product sales, net			37,168	59,336
Dental Segment [Member] | Accessories [Member] | Rest of World [Member]
Product sales, net	29,534	11,201	37,092	39,647
Product sales, net	29,534	11,201	37,092	39,647
Dental Segment [Member] | Accessories [Member] | CHINA
Product sales, net			0	0
Product sales, net			0	0
Medical Segment [Member]
Product sales, net	47,400	6,000	73,820	10,000
Product sales, net	47,400	6,000	73,820	10,000
Medical Segment [Member] | UNITED STATES
Product sales, net	12,400	0
Product sales, net	12,400	0
Medical Segment [Member] | Domestic [Member]
Product sales, net			37,400	0
Product sales, net			37,400	0
Medical Segment [Member] | Rest of World [Member]
Product sales, net	35,000	6,000	36,420	10,000
Product sales, net	35,000	6,000	36,420	10,000
Medical Segment [Member] | CHINA
Product sales, net			0	0
Product sales, net			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			2,000	0
Product sales, net			2,000	0
Medical Segment [Member] | Instruments [Member] | Rest of World [Member]
Product sales, net	32,500	0	32,500	0
Product sales, net	32,500	0	32,500	0
Medical Segment [Member] | Instruments [Member] | CHINA
Product sales, net			0	0
Product sales, net			0	0
Medical Segment [Member] | Handpieces [Member] | UNITED STATES
Product sales, net	11,400	0
Product sales, net	11,400	0
Medical Segment [Member] | Handpieces [Member] | Domestic [Member]
Product sales, net			35,400	0
Product sales, net			35,400	0
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member]
Product sales, net	2,500	6,000	3,920	10,000
Product sales, net	2,500	6,000	3,920	10,000
Medical Segment [Member] | Handpieces [Member] | CHINA
Product sales, net			0	0
Product sales, net			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
Product sales, net			$ 0	$ 0