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Note 11 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Product sales, net | $ 2,425,738 | $ 167,674 | $ 5,350,445 | $ 1,979,060
Dental Segment [Member] |  |  |  |
Product sales, net | 2,404,738 | 165,674 | 5,258,395 | 1,969,260
Medical Segment [Member] |  |  |  |
Product sales, net | 21,000 | 2,000 | 92,050 | 9,800
Domestic [Member] |  |  |  |
Product sales, net | 1,000,642 | 40,354 | 1,997,700 | 657,605
Domestic [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 1,000,642 | 38,354 | 1,989,550 | 655,605
Domestic [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 2,000 | 8,150 | 2,000
Domestic [Member] | Instruments [Member] |  |  |  |
Product sales, net | 178,752 | 0 | 354,768 | 525
Domestic [Member] | Instruments [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 178,752 | 0 | 354,768 | 525
Domestic [Member] | Instruments [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Domestic [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 802,916 | 38,812 | 1,606,050 | 635,490
Domestic [Member] | Handpieces [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 802,916 | 36,812 | 1,597,900 | 633,490
Domestic [Member] | Handpieces [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 2,000 | 8,150 | 2,000
Domestic [Member] | Accessories [Member] |  |  |  |
Product sales, net | 18,974 | 1,542 | 36,882 | 21,590
Domestic [Member] | Accessories [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 18,974 | 1,542 | 36,882 | 21,590
Domestic [Member] | Accessories [Member] | Medical Segment [Member] |  |  |  |
Product sales, net |  |  |  |
Rest of World [Member] | Instruments [Member] |  |  |  |
Product sales, net | 172,088 | 31,800 | 597,841 | 281,904
Rest of World [Member] | Instruments [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 156,588 | 31,800 | 539,841 | 274,304
Rest of World [Member] | Instruments [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 15,500 | 0 | 58,000 | 7,600
Rest of World [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 715,124 | 87,632 | 1,689,459 | 1,018,123
Rest of World [Member] | Handpieces [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 709,624 | 87,632 | 1,663,559 | 1,017,923
Rest of World [Member] | Handpieces [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 5,500 | 0 | 25,900 | 200
Rest of World [Member] | Accessories [Member] |  |  |  |
Product sales, net | 12,548 | 7,888 | 33,109 | 21,428
Rest of World [Member] | Accessories [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 12,548 | 7,888 | 33,109 | 21,428
Rest of World [Member] | Accessories [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
International [Member] |  |  |  |
Product sales, net | 899,761 | 127,320 | 2,320,409 | 1,321,455
International [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 878,761 | 127,320 | 2,236,509 | 1,313,655
International [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 21,000 | 0 | 83,900 | 7,800
CHINA |  |  |  |
Product sales, net | 525,336 | 0 | 1,032,336 | 0
CHINA | Dental Segment [Member] |  |  |  |
Product sales, net | 525,336 | 0 | 1,032,336 | 0
CHINA | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
CHINA | Instruments [Member] |  |  |  |
Product sales, net | 78,000 | 0 | 228,000 | 0
CHINA | Instruments [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 78,000 | 0 | 228,000 | 0
CHINA | Instruments [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
CHINA | Handpieces [Member] |  |  |  |
Product sales, net | 447,336 | 0 | 804,336 | 0
CHINA | Handpieces [Member] | Dental Segment [Member] |  |  |  |
Product sales, net | 447,336 | 0 | 804,336 | 0
CHINA | Handpieces [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
CHINA | Other Products [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
CHINA | Other Products [Member] | Dental Segment [Member] |  |  |  |
Product sales, net |  |  |  | 0
CHINA | Other Products [Member] | Medical Segment [Member] |  |  |  |
Product sales, net | $ 0 | $ 0 | $ 0 |

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