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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, 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

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