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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30, 2021

   

December 31, 2020

 
                 

Dental finished goods, net

  $ 526,308     $ 1,888,141  

Medical finished goods, net

    1,057,476       200,327  

Component parts and other materials

    92,748       331,711  

Total inventories

  $ 1,676,532     $ 2,420,179