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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

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