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Note 4 - Inventories - Summary of Inventories (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Component parts and other materials | $ 74,280 | $ 218,486
Total inventories | 3,711,636 | 2,638,186
Dental Segment [Member] |  |
Finished goods, net | 3,637,356 | 2,404,970
Medical Segment [Member] |  |
Finished goods, net | $ 0 | $ 14,730

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