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Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Product sales, net | $ 2,909,966 | $ 1,648,368 | $ 5,507,564 | $ 4,349,270
CHINA |  |  |  |
Product sales, net | 270,000 | 0 | 270,000 | 359,964
Domestic [Member] |  |  |  |
Product sales, net | 1,420,580 | 997,782 | 2,809,903 | 1,949,019
Rest of World [Member] |  |  |  |
Product sales, net | 1,219,386 | 650,586 | 2,427,661 | 2,040,287
Instruments [Member] | CHINA |  |  |  |
Product sales, net | 270,000 | 0 | 270,000 | 0
Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net | 271,215 | 155,028 | 495,683 | 277,996
Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 474,250 | 160,814 | 873,205 | 614,374
Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 359,964
Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net | 1,127,922 | 820,133 | 2,269,900 | 1,623,542
Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 732,894 | 479,799 | 1,526,010 | 1,403,751
Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net | 21,443 | 22,621 | 44,320 | 47,481
Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 12,242 | 9,973 | 28,446 | 22,162
Dental Segment [Member] |  |  |  |
Product sales, net | 2,912,166 | 1,609,768 | 5,503,564 | 4,303,120
Dental Segment [Member] | CHINA |  |  |  |
Product sales, net | 270,000 | 0 | 270,000 | 359,964
Dental Segment [Member] | Domestic [Member] |  |  |  |
Product sales, net | 1,422,780 | 979,182 | 2,809,903 | 1,922,869
Dental Segment [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 1,219,386 | 630,586 | 2,423,661 | 2,020,287
Dental Segment [Member] | Instruments [Member] | CHINA |  |  |  |
Product sales, net | 270,000 | 0 | 270,000 | 0
Dental Segment [Member] | Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net | 271,215 | 155,028 | 495,683 | 277,996
Dental Segment [Member] | Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 474,250 | 160,814 | 873,205 | 614,374
Dental Segment [Member] | Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 359,964
Dental Segment [Member] | Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net | 1,130,122 | 801,533 | 2,269,900 | 1,597,392
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 732,894 | 459,799 | 1,522,010 | 1,383,751
Dental Segment [Member] | Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Dental Segment [Member] | Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net | 21,443 | 22,621 | 44,320 | 47,481
Dental Segment [Member] | Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 12,242 | 9,973 | 28,446 | 22,162
Medical Segment [Member] |  |  |  |
Product sales, net | (2,200) | 38,600 | 4,000 | 46,150
Medical Segment [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Domestic [Member] |  |  |  |
Product sales, net | (2,200) | 18,600 | 0 | 26,150
Medical Segment [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 20,000 | 4,000 | 20,000
Medical Segment [Member] | Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net | (2,200) | 18,600 | 0 | 26,150
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 20,000 | 4,000 | 20,000
Medical Segment [Member] | Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | $ 0 | $ 0 | $ 0 | $ 0

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