Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Inventories - Summary of Inventories (Details)

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Note 4 - Inventories - Summary of Inventories (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Component parts and other materials $ 181,324 $ 331,711
Total inventories 1,479,391 2,420,179
Dental Segment [Member]    
Finished goods, net 764,434 1,888,141
Medical Segment [Member]    
Finished goods, net $ 533,633 $ 200,327