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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Product sales, net | $ 2,215,699 | $ 2,108,233 | $ 6,564,969 | $ 7,458,678
Dental Segment [Member] |  |  |  |
Product sales, net | 2,206,499 | 2,076,233 | 6,509,619 | 7,334,628
Medical Segment [Member] |  |  |  |
Product sales, net | 9,200 | 32,000 | 55,350 | 124,050
Domestic [Member] |  |  |  |
Product sales, net | 876,318 | 790,382 | 2,826,761 | 2,788,083
Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 867,118 | 778,882 | 2,791,411 | 2,768,433
Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 9,200 | 11,500 | 35,350 | 19,650
Rest of World [Member] |  |  |  |
Product sales, net | 1,339,381 | 956,996 | 3,378,244 | 3,277,404
Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 1,339,381 | 936,496 | 3,358,244 | 3,173,004
Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 20,500 | 20,000 | 104,400
CHINA |  |  |  |
Product sales, net | 0 | 360,855 | 359,964 | 1,393,191
CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 360,855 | 359,964 | 1,393,191
CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net | 171,841 | 36,480 | 449,836 | 391,250
Instruments [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 164,341 | 36,480 | 442,336 | 391,250
Instruments [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 7,500 | 0 | 7,500 | 0
Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 436,069 | 257,563 | 1,050,443 | 855,403
Instruments [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 436,069 | 253,063 | 1,050,443 | 792,903
Instruments [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 4,500 | 0 | 62,500
Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 228,000
Instruments [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 228,000
Instruments [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net | 680,173 | 732,649 | 2,301,615 | 2,338,699
Handpieces [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 678,473 | 721,149 | 2,275,865 | 2,319,049
Handpieces [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 1,700 | 11,500 | 25,750 | 19,650
Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 881,616 | 690,133 | 2,285,367 | 2,379,592
Handpieces [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 881,616 | 674,133 | 2,265,367 | 2,337,692
Handpieces [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 16,000 | 20,000 | 41,900
Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 360,855 | 359,964 | 1,165,191
Handpieces [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 | 360,855 | 359,964 | 1,165,191
Handpieces [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net | 24,304 | 21,253 | 75,310 | 58,134
Accessories [Member] | Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 24,304 | 21,253 | 73,210 | 58,134
Accessories [Member] | Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 2,100 | 0
Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 21,696 | 9,300 | 42,434 | 42,409
Accessories [Member] | Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 21,696 | 9,300 | 42,434 | 42,409
Accessories [Member] | Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 |  | 0 | 0
Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 0 |  | 0 | 0
Accessories [Member] | CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | $ 0 | $ 0 | $ 0 | $ 0

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