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Note 8 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Product sales, net | $ 1,853,764 | $ 2,909,966 | $ 4,102,609 | $ 5,507,564
Product sales, net | 1,853,764 | 2,909,966 | 4,102,609 | 5,507,564
UNITED STATES |  |  |  |
Product sales, net | 1,364,777 | 1,420,580 |  |
Product sales, net | 1,364,777 | 1,420,580 |  |
Domestic [Member] |  |  |  |
Product sales, net |  |  | 2,683,195 | 2,809,903
Product sales, net |  |  | 2,683,195 | 2,809,903
Rest of World [Member] |  |  |  |
Product sales, net | 488,987 | 1,219,386 | 1,419,414 | 2,427,661
Product sales, net | 488,987 | 1,219,386 | 1,419,414 | 2,427,661
CHINA |  |  |  |
Product sales, net | 0 | 270,000 | 0 | 270,000
Product sales, net | 0 | 270,000 | 0 | 270,000
Instruments [Member] | UNITED STATES |  |  |  |
Product sales, net | 195,676 | 271,215 |  |
Product sales, net | 195,676 | 271,215 |  |
Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 409,551 | 495,683
Product sales, net |  |  | 409,551 | 495,683
Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 125,176 | 474,250 | 407,262 | 873,205
Product sales, net | 125,176 | 474,250 | 407,262 | 873,205
Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 270,000 | 0 | 270,000
Product sales, net | 0 | 270,000 | 0 | 270,000
Handpieces [Member] | UNITED STATES |  |  |  |
Product sales, net | 1,154,124 | 1,127,922 |  |
Product sales, net | 1,154,124 | 1,127,922 |  |
Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 2,241,977 | 2,269,900
Product sales, net |  |  | 2,241,977 | 2,269,900
Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 357,645 | 732,894 | 1,004,594 | 1,526,010
Product sales, net | 357,645 | 732,894 | 1,004,594 | 1,526,010
Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Accessories [Member] | UNITED STATES |  |  |  |
Product sales, net | 14,977 | 21,443 |  |
Product sales, net | 14,977 | 21,443 |  |
Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 31,667 | 44,320
Product sales, net |  |  | 31,667 | 44,320
Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 6,166 | 12,242 | 7,558 | 28,446
Product sales, net | 6,166 | 12,242 | 7,558 | 28,446
Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Dental Segment [Member] |  |  |  |
Product sales, net | 1,834,764 | 2,912,166 | 4,076,189 | 5,503,564
Product sales, net | 1,834,764 | 2,912,166 | 4,076,189 | 5,503,564
Dental Segment [Member] | UNITED STATES |  |  |  |
Product sales, net | 1,345,777 | 1,422,780 |  |
Product sales, net | 1,345,777 | 1,422,780 |  |
Dental Segment [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 2,656,775 | 2,809,903
Product sales, net |  |  | 2,656,775 | 2,809,903
Dental Segment [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 488,987 | 1,219,386 | 1,419,414 | 2,423,661
Product sales, net | 488,987 | 1,219,386 | 1,419,414 | 2,423,661
Dental Segment [Member] | CHINA |  |  |  |
Product sales, net | 0 | 270,000 | 0 | 270,000
Product sales, net | 0 | 270,000 | 0 | 270,000
Dental Segment [Member] | Instruments [Member] | UNITED STATES |  |  |  |
Product sales, net | 194,676 | 271,215 |  |
Product sales, net | 194,676 | 271,215 |  |
Dental Segment [Member] | Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 408,551 | 495,683
Product sales, net |  |  | 408,551 | 495,683
Dental Segment [Member] | Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 125,176 | 474,250 | 407,262 | 873,205
Product sales, net | 125,176 | 474,250 | 407,262 | 873,205
Dental Segment [Member] | Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 270,000 | 0 | 270,000
Product sales, net | 0 | 270,000 | 0 | 270,000
Dental Segment [Member] | Handpieces [Member] | UNITED STATES |  |  |  |
Product sales, net | 1,136,124 | 1,130,122 |  |
Product sales, net | 1,136,124 | 1,130,122 |  |
Dental Segment [Member] | Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 2,216,557 | 2,269,900
Product sales, net |  |  | 2,216,557 | 2,269,900
Dental Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 357,645 | 732,894 | 1,004,594 | 1,522,010
Product sales, net | 357,645 | 732,894 | 1,004,594 | 1,522,010
Dental Segment [Member] | Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Dental Segment [Member] | Accessories [Member] | UNITED STATES |  |  |  |
Product sales, net | 14,977 | 21,443 |  |
Product sales, net | 14,977 | 21,443 |  |
Dental Segment [Member] | Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 31,667 | 44,320
Product sales, net |  |  | 31,667 | 44,320
Dental Segment [Member] | Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 6,166 | 12,242 | 7,558 | 28,446
Product sales, net | 6,166 | 12,242 | 7,558 | 28,446
Dental Segment [Member] | Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] |  |  |  |
Product sales, net | 19,000 | (2,200) | 26,420 | 4,000
Product sales, net | 19,000 | (2,200) | 26,420 | 4,000
Medical Segment [Member] | UNITED STATES |  |  |  |
Product sales, net | 19,000 | (2,200) |  |
Product sales, net | 19,000 | (2,200) |  |
Medical Segment [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 26,420 | 0
Product sales, net |  |  | 26,420 | 0
Medical Segment [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 4,000
Product sales, net | 0 | 0 | 0 | 4,000
Medical Segment [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Instruments [Member] | UNITED STATES |  |  |  |
Product sales, net | 1,000 | 0 |  |
Product sales, net | 1,000 | 0 |  |
Medical Segment [Member] | Instruments [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 1,000 | 0
Product sales, net |  |  | 1,000 | 0
Medical Segment [Member] | Instruments [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Instruments [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Handpieces [Member] | UNITED STATES |  |  |  |
Product sales, net | 18,000 | (2,200) |  |
Product sales, net | 18,000 | (2,200) |  |
Medical Segment [Member] | Handpieces [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 25,420 | 0
Product sales, net |  |  | 25,420 | 0
Medical Segment [Member] | Handpieces [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 4,000
Product sales, net | 0 | 0 | 0 | 4,000
Medical Segment [Member] | Handpieces [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Accessories [Member] | UNITED STATES |  |  |  |
Product sales, net | 0 | 0 |  |
Product sales, net | 0 | 0 |  |
Medical Segment [Member] | Accessories [Member] | Domestic [Member] |  |  |  |
Product sales, net |  |  | 0 | 0
Product sales, net |  |  | 0 | 0
Medical Segment [Member] | Accessories [Member] | Rest of World [Member] |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | 0 | 0 | 0 | 0
Medical Segment [Member] | Accessories [Member] | CHINA |  |  |  |
Product sales, net | 0 | 0 | 0 | 0
Product sales, net | $ 0 | $ 0 | $ 0 | $ 0

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