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Note 4 - Inventories - Summary of Inventories (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Component parts and other materials | $ 166,350 | $ 142,948
Total inventories | 2,482,630 | 1,792,335
Dental Segment [Member] |  |
Finished goods, net | 2,090,638 | 1,315,263
Medical Segment [Member] |  |
Finished goods, net | $ 225,642 | $ 334,124

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