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Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Product sales, net | $ 2,924,707 | $ 1,811,386
Dental Segment [Member] |  |
Product sales, net | 2,856,658 | 1,803,586
Medical Segment [Member] |  |
Product sales, net | 71,050 | 7,800
Domestic [Member] |  |
Product sales, net | 997,058 | 720,391
Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 988,908 | 720,391
Domestic [Member] | Medical Segment [Member] |  |
Product sales, net | 8,150 |
Domestic [Member] | Instruments [Member] |  |
Product sales, net | 176,016 | 525
Domestic [Member] | Instruments [Member] | Dental Segment [Member] |  |
Product sales, net | 176,016 | 525
Domestic [Member] | Instruments [Member] | Medical Segment [Member] |  |
Product sales, net |  |
Domestic [Member] | Handpieces [Member] |  |
Product sales, net | 803,134 | 697,360
Domestic [Member] | Handpieces [Member] | Dental Segment [Member] |  |
Product sales, net | 794,984 | 697,360
Domestic [Member] | Handpieces [Member] | Medical Segment [Member] |  |
Product sales, net | 8,150 |
Domestic [Member] | Accessories [Member] |  |
Product sales, net | 17,908 | 22,506
Domestic [Member] | Accessories [Member] | Dental Segment [Member] |  |
Product sales, net | 17,908 | 22,506
Domestic [Member] | Accessories [Member] | Medical Segment [Member] |  |
Product sales, net |  |
Rest of World [Member] | Instruments [Member] |  |
Product sales, net | 425,755 | 250,104
Rest of World [Member] | Instruments [Member] | Dental Segment [Member] |  |
Product sales, net | 383,255 | 242,504
Rest of World [Member] | Instruments [Member] | Medical Segment [Member] |  |
Product sales, net | 42,500 | 7,600
Rest of World [Member] | Handpieces [Member] |  |
Product sales, net | 974,934 | 830,408
Rest of World [Member] | Handpieces [Member] | Dental Segment [Member] |  |
Product sales, net | 954,534 | 830,208
Rest of World [Member] | Handpieces [Member] | Medical Segment [Member] |  |
Product sales, net | 20,400 | 200
Rest of World [Member] | Accessories [Member] |  |
Product sales, net | 20,560 | 10,483
Rest of World [Member] | Accessories [Member] | Dental Segment [Member] |  |
Product sales, net | 20,560 | 10,483
Rest of World [Member] | Accessories [Member] | Medical Segment [Member] |  |
Product sales, net |  |
International [Member] |  |
Product sales, net | 1,421,249 | 1,090,995
International [Member] | Dental Segment [Member] |  |
Product sales, net | 1,358,349 | 1,083,195
International [Member] | Medical Segment [Member] |  |
Product sales, net | 62,900 | 7,800
CHINA |  |
Product sales, net | 506,400 |
CHINA | Dental Segment [Member] |  |
Product sales, net | 506,400 |
CHINA | Medical Segment [Member] |  |
Product sales, net |  |
CHINA | Handpieces [Member] |  |
Product sales, net | 356,400 |
CHINA | Handpieces [Member] | Dental Segment [Member] |  |
Product sales, net | 356,400 |
CHINA | Handpieces [Member] | Medical Segment [Member] |  |
Product sales, net |  |
CHINA | Devices [Member] |  |
Product sales, net | 150,000 |
CHINA | Devices [Member] | Dental Segment [Member] |  |
Product sales, net | 150,000 |
CHINA | Devices [Member] | Medical Segment [Member] |  |
Product sales, net |  |
CHINA | Other Products [Member] |  |
Product sales, net |  |
CHINA | Other Products [Member] | Dental Segment [Member] |  |
Product sales, net |  |
CHINA | Other Products [Member] | Medical Segment [Member] |  |
Product sales, net |  |

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