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Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Product sales, net | $ 1,246,110 | $ 1,899,821 | $ 3,225,170 | $ 6,073,580
Dental Segment [Member] |  |  |  |
Product sales, net | 1,240,110 | 1,884,321 | 3,209,370 | 6,042,580
Medical Segment [Member] |  |  |  |
Product sales, net | 6,000 | 15,500 | 15,800 | 31,000
Domestic [Member] |  |  |  |
Product sales, net | 408,129 | 896,890 | 1,067,133 | 2,721,779
Domestic [Member] | Devices [Member] |  |  |  |
Product sales, net | 34,657 | 199,926 | 35,181 | 409,529
Domestic [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 356,566 | 679,621 | 994,057 | 2,250,842
Domestic [Member] | Other Products [Member] |  |  |  |
Product sales, net | 16,906 | 17,343 | 37,895 | 61,408
Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 408,129 | 896,890 | 1,065,133 | 2,710,679
Domestic [Member] | Dental Segment [Member] | Devices [Member] |  |  |  |
Product sales, net | 34,657 | 199,926 | 35,181 | 398,729
Domestic [Member] | Dental Segment [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 356,566 | 679,621 | 992,057 | 2,250,542
Domestic [Member] | Dental Segment [Member] | Other Products [Member] |  |  |  |
Product sales, net | 16,906 | 17,343 | 37,895 | 61,408
Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net |  |  | 2,000 | 11,100
Domestic [Member] | Medical Segment [Member] | Devices [Member] |  |  |  |
Product sales, net |  |  |  | 10,800
Domestic [Member] | Medical Segment [Member] | Handpieces [Member] |  |  |  |
Product sales, net |  |  | 2,000 | 300
Domestic [Member] | Medical Segment [Member] | Other Products [Member] |  |  |  |
Product sales, net |  |  |  |
Rest of World [Member] |  |  |  |
Product sales, net |  |  | 2,158,037 | 3,251,801
Rest of World [Member] | Devices [Member] |  |  |  |
Product sales, net | 220,694 | 412,819 | 502,598 | 1,108,488
Rest of World [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 608,000 | 579,765 | 1,624,724 | 2,040,250
Rest of World [Member] | Other Products [Member] |  |  |  |
Product sales, net | 9,287 | 10,347 | 30,715 | 103,063
Rest of World [Member] | Dental Segment [Member] |  |  |  |
Product sales, net |  |  | 2,144,237 | 3,231,901
Rest of World [Member] | Dental Segment [Member] | Devices [Member] |  |  |  |
Product sales, net | 220,694 | 412,819 | 494,998 | 1,100,488
Rest of World [Member] | Dental Segment [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 602,000 | 564,265 | 1,618,524 | 2,028,750
Rest of World [Member] | Dental Segment [Member] | Other Products [Member] |  |  |  |
Product sales, net | 9,287 | 10,347 | 30,715 | 102,663
Rest of World [Member] | Medical Segment [Member] |  |  |  |
Product sales, net |  |  | 13,800 | 19,900
Rest of World [Member] | Medical Segment [Member] | Devices [Member] |  |  |  |
Product sales, net |  |  | 7,600 | 8,000
Rest of World [Member] | Medical Segment [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 6,000 | 15,500 | 6,200 | 11,500
Rest of World [Member] | Medical Segment [Member] | Other Products [Member] |  |  |  |
Product sales, net |  |  |  | 400
International [Member] |  |  |  |
Product sales, net | 837,981 | 1,002,931 |  |
International [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 831,981 | 987,431 |  |
International [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 6,000 | 15,500 |  |
CHINA |  |  |  |
Product sales, net |  |  |  | 100,000
CHINA | Devices [Member] |  |  |  |
Product sales, net |  |  |  |
CHINA | Handpieces [Member] |  |  |  |
Product sales, net |  |  |  | 100,000
CHINA | Other Products [Member] |  |  |  |
Product sales, net |  |  |  |
CHINA | Dental Segment [Member] |  |  |  |
Product sales, net |  |  |  | 100,000
CHINA | Dental Segment [Member] | Devices [Member] |  |  |  |
Product sales, net |  |  |  |
CHINA | Dental Segment [Member] | Handpieces [Member] |  |  |  |
Product sales, net |  |  |  | 100,000
CHINA | Dental Segment [Member] | Other Products [Member] |  |  |  |
Product sales, net |  |  |  |
CHINA | Medical Segment [Member] |  |  |  |
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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