Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Product sales, net	$ 2,059,284	$ 2,215,699	$ 7,566,848	$ 6,564,969
Dental Segment [Member]
Product sales, net	2,053,284	2,206,499	7,556,848	6,509,619
Medical Segment [Member]
Product sales, net	6,000	9,200	10,000	55,350
Domestic [Member]
Product sales, net	1,253,367	876,318	4,063,270	2,826,761
Domestic [Member] | Instruments [Member]
Product sales, net	230,615	171,841	726,104	449,836
Domestic [Member] | Handpieces [Member]
Product sales, net	1,007,930	680,173	3,277,830	2,301,615
Domestic [Member] | Accessories [Member]
Product sales, net	14,822	24,304	59,336	75,310
Domestic [Member] | Dental Segment [Member]
Product sales, net	1,253,367	867,118	4,063,270	2,791,411
Domestic [Member] | Dental Segment [Member] | Instruments [Member]
Product sales, net	230,615	164,341	726,104	442,336
Domestic [Member] | Dental Segment [Member] | Handpieces [Member]
Product sales, net	1,007,930	678,473	3,277,830	2,275,865
Domestic [Member] | Dental Segment [Member] | Accessories [Member]
Product sales, net	14,822	24,304	59,336	73,210
Domestic [Member] | Medical Segment [Member]
Product sales, net	0	9,200	0	35,350
Domestic [Member] | Medical Segment [Member] | Instruments [Member]
Product sales, net	0	7,500	0	7,500
Domestic [Member] | Medical Segment [Member] | Handpieces [Member]
Product sales, net	0	1,700	0	25,750
Domestic [Member] | Medical Segment [Member] | Accessories [Member]
Product sales, net	0	0	0	2,100
Rest of World [Member]
Product sales, net	805,917	1,339,381	3,233,578	3,378,244
Rest of World [Member] | Instruments [Member]
Product sales, net	88,019	436,069	961,224	1,050,443
Rest of World [Member] | Handpieces [Member]
Product sales, net	706,697	881,616	2,232,707	2,285,367
Rest of World [Member] | Accessories [Member]
Product sales, net	11,201	21,696	39,647	42,434
Rest of World [Member] | Dental Segment [Member]
Product sales, net	799,917	1,339,381	3,223,578	3,358,244
Rest of World [Member] | Dental Segment [Member] | Instruments [Member]
Product sales, net	88,019	436,069	961,224	1,050,443
Rest of World [Member] | Dental Segment [Member] | Handpieces [Member]
Product sales, net	700,697	881,616	2,222,707	2,265,367
Rest of World [Member] | Dental Segment [Member] | Accessories [Member]
Product sales, net	11,201	21,696	39,647	42,434
Rest of World [Member] | Medical Segment [Member]
Product sales, net	6,000	0	10,000	20,000
Rest of World [Member] | Medical Segment [Member] | Instruments [Member]
Product sales, net	0	0	0	0
Rest of World [Member] | Medical Segment [Member] | Handpieces [Member]
Product sales, net	6,000	0	10,000	20,000
Rest of World [Member] | Medical Segment [Member] | Accessories [Member]
Product sales, net	$ 0	$ 0	0	0
CHINA
Product sales, net			270,000	359,964
CHINA | Instruments [Member]
Product sales, net			270,000	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			270,000	359,964
CHINA | Dental Segment [Member] | Instruments [Member]
Product sales, net			270,000	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