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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Product sales, net | $ 2,700,902 | $ 2,924,707
Dental Segment [Member] |  |
Product sales, net | 2,693,352 | 2,853,657
Medical Segment [Member] |  |
Product sales, net | 7,550 | 71,050
Domestic [Member] |  |
Product sales, net | 951,237 | 997,058
Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 943,687 | 988,908
Domestic [Member] | Medical Segment [Member] |  |
Product sales, net | 7,550 | 8,150
Rest of World [Member] |  |
Product sales, net | 1,389,701 | 1,421,249
Rest of World [Member] | Dental Segment [Member] |  |
Product sales, net | 1,389,701 | 1,358,349
Rest of World [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 62,900
CHINA |  |
Product sales, net | 359,964 | 506,400
CHINA | Dental Segment [Member] |  |
Product sales, net | 359,964 | 506,400
CHINA | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Instruments [Member] | Domestic [Member] |  |
Product sales, net | 122,968 | 176,016
Instruments [Member] | Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 122,968 | 176,016
Instruments [Member] | Domestic [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Instruments [Member] | Rest of World [Member] |  |
Product sales, net | 453,560 | 425,755
Instruments [Member] | Rest of World [Member] | Dental Segment [Member] |  |
Product sales, net | 453,560 | 383,255
Instruments [Member] | Rest of World [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 42,500
Instruments [Member] | CHINA |  |
Product sales, net | 0 | 150,000
Instruments [Member] | CHINA | Dental Segment [Member] |  |
Product sales, net | 0 | 150,000
Instruments [Member] | CHINA | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Handpieces [Member] | Domestic [Member] |  |
Product sales, net | 803,409 | 803,134
Handpieces [Member] | Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 795,859 | 794,984
Handpieces [Member] | Domestic [Member] | Medical Segment [Member] |  |
Product sales, net | 7,550 | 8,150
Handpieces [Member] | Rest of World [Member] |  |
Product sales, net | 923,952 | 974,934
Handpieces [Member] | Rest of World [Member] | Dental Segment [Member] |  |
Product sales, net | 923,952 | 954,534
Handpieces [Member] | Rest of World [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 20,400
Handpieces [Member] | CHINA |  |
Product sales, net | 359,964 | 356,400
Handpieces [Member] | CHINA | Dental Segment [Member] |  |
Product sales, net | 359,964 | 356,400
Handpieces [Member] | CHINA | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Accessories [Member] | Domestic [Member] |  |
Product sales, net | 24,860 | 17,908
Accessories [Member] | Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 24,860 | 17,908
Accessories [Member] | Domestic [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Accessories [Member] | Rest of World [Member] |  |
Product sales, net | 12,189 | 20,560
Accessories [Member] | Rest of World [Member] | Dental Segment [Member] |  |
Product sales, net | 12,189 | 20,560
Accessories [Member] | Rest of World [Member] | Medical Segment [Member] |  |
Product sales, net | 0 | 0
Accessories [Member] | CHINA |  |
Product sales, net | 0 | 0
Accessories [Member] | CHINA | Dental Segment [Member] |  |
Product sales, net | 0 | 0
Accessories [Member] | CHINA | Medical Segment [Member] |  |
Product sales, net | $ 0 | $ 0

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