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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 31, 2022

  

December 31, 2021

 
         

Dental finished goods, net

 $632,003  $342,465 

Medical finished goods, net

  989,257   1,119,709 

Component parts and other materials

  178,648   79,339 

Total inventories

 $1,799,908  $1,541,513