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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Product sales, net | $ 1,811,386 | $ 1,915,909
Product sales, net | 43,242 |
Dental Segment [Member] |  |
Product sales, net | 1,803,586 | 1,915,509
Medical Segment [Member] |  |
Product sales, net | 7,800 | 400
Domestic [Member] |  |
Product sales, net | 720,391 | 930,364
Domestic [Member] | Devices [Member] |  |
Product sales, net | 525 | 123,994
Domestic [Member] | Handpieces [Member] |  |
Product sales, net | 697,360 | 789,553
Domestic [Member] | Other Products [Member] |  |
Product sales, net | 22,506 | 16,817
Domestic [Member] | Dental Segment [Member] |  |
Product sales, net | 720,391 | 929,964
Domestic [Member] | Dental Segment [Member] | Devices [Member] |  |
Product sales, net | 525 | 123,994
Domestic [Member] | Dental Segment [Member] | Handpieces [Member] |  |
Product sales, net | 697,360 | 789,153
Domestic [Member] | Dental Segment [Member] | Other Products [Member] |  |
Product sales, net | 22,506 | 16,817
Domestic [Member] | Medical Segment [Member] |  |
Product sales, net |  | 400
Domestic [Member] | Medical Segment [Member] | Devices [Member] |  |
Product sales, net |  |
Domestic [Member] | Medical Segment [Member] | Handpieces [Member] |  |
Product sales, net |  | 400
Domestic [Member] | Medical Segment [Member] | Other Products [Member] |  |
Product sales, net |  |
Rest of World [Member] |  |
Product sales, net | 1,090,995 | 935,545
Rest of World [Member] | Devices [Member] |  |
Product sales, net | 250,104 | 285,345
Rest of World [Member] | Handpieces [Member] |  |
Product sales, net | 830,408 | 631,311
Rest of World [Member] | Other Products [Member] |  |
Product sales, net | 10,483 | 18,889
Rest of World [Member] | Dental Segment [Member] |  |
Product sales, net | 1,083,195 | 935,545
Rest of World [Member] | Dental Segment [Member] | Devices [Member] |  |
Product sales, net | 242,504 | 285,345
Rest of World [Member] | Dental Segment [Member] | Handpieces [Member] |  |
Product sales, net | 830,208 | 631,311
Rest of World [Member] | Dental Segment [Member] | Other Products [Member] |  |
Product sales, net | 10,483 | 18,889
Rest of World [Member] | Medical Segment [Member] |  |
Product sales, net | 7,800 |
Rest of World [Member] | Medical Segment [Member] | Devices [Member] |  |
Product sales, net | 7,600 |
Rest of World [Member] | Medical Segment [Member] | Handpieces [Member] |  |
Product sales, net | 200 |
Rest of World [Member] | Medical Segment [Member] | Other Products [Member] |  |
Product sales, net |  |
CHINA |  |
Product sales, net |  | 50,000
Product sales, net |  |
CHINA | Devices [Member] |  |
Product sales, net |  |
CHINA | Handpieces [Member] |  |
Product sales, net |  | 50,000
CHINA | Other Products [Member] |  |
Product sales, net |  |
CHINA | Dental Segment [Member] |  |
Product sales, net |  | 50,000
Product sales, net |  |
CHINA | Dental Segment [Member] | Devices [Member] |  |
Product sales, net |  |
CHINA | Dental Segment [Member] | Handpieces [Member] |  |
Product sales, net |  | 50,000
CHINA | Dental Segment [Member] | Other Products [Member] |  |
Product sales, net |  |
CHINA | Medical Segment [Member] |  |
Product sales, net |  |
Product sales, net |  |
CHINA | Medical Segment [Member] | Devices [Member] |  |
Product sales, net |  |
CHINA | Medical Segment [Member] | Handpieces [Member] |  |
Product sales, net |  |
CHINA | Medical Segment [Member] | Other Products [Member] |  |
Product sales, net |  |

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