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Note 10 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Product sales, net | $ 1,899,821 | $ 1,622,246 | $ 6,073,580 | $ 5,856,351
Product sales, net | 1,899,821 | 1,622,246 | 6,073,580 | 5,856,351
Domestic [Member] |  |  |  |
Product sales, net | 1,047,180 | 509,254 | 3,186,287 | 2,620,541
Product sales, net | 1,047,180 | 509,254 | 3,186,287 | 2,620,541
Domestic [Member] | Devices [Member] |  |  |  |
Product sales, net | 216,076 | 119,190 | 486,360 | 251,743
Product sales, net | 216,076 | 119,190 | 486,360 | 251,743
Domestic [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 812,655 | 369,027 | 2,632,199 | 2,296,533
Product sales, net | 812,655 | 369,027 | 2,632,199 | 2,296,533
Domestic [Member] | Other Products [Member] |  |  |  |
Product sales, net | 18,449 | 21,037 | 67,728 | 72,265
Product sales, net | 18,449 | 21,037 | 67,728 | 72,265
Rest of World [Member] |  |  |  |
Product sales, net | 852,641 | 812,992 | 2,787,293 | 2,935,810
Product sales, net | 852,641 | 812,992 | 2,787,293 | 2,935,810
Rest of World [Member] | Devices [Member] |  |  |  |
Product sales, net | 391,768 | 299,872 | 1,016,683 | 952,390
Product sales, net | 391,768 | 299,872 | 1,016,683 | 952,390
Rest of World [Member] | Handpieces [Member] |  |  |  |
Product sales, net | 451,631 | 506,880 | 1,714,471 | 1,924,901
Product sales, net | 451,631 | 506,880 | 1,714,471 | 1,924,901
Rest of World [Member] | Other Products [Member] |  |  |  |
Product sales, net | 9,242 | 6,240 | 56,139 | 58,519
Product sales, net | 9,242 | 6,240 | 56,139 | 58,519
CHINA |  |  |  |
Product sales, net |  | 300,000 | 100,000 | 300,000
Product sales, net |  | 300,000 | 100,000 | 300,000
CHINA | Devices [Member] |  |  |  |
Product sales, net |  |  |  |
Product sales, net |  |  |  |
CHINA | Handpieces [Member] |  |  |  |
Product sales, net |  | 300,000 | 100,000 | 300,000
Product sales, net |  | 300,000 | 100,000 | 300,000
CHINA | Other Products [Member] |  |  |  |
Product sales, net |  |  |  |
Product sales, net |  |  |  |

X
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