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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2020
   
December 31, 2019
 
 
               
Dental finished goods, net
   $
1,506,621
     $
1,306,763
 
Medical finished goods, net
   
255,217
     
213,861
 
Component parts and other materials
   
90,615
     
99,885
 
Total inventories
   $
1,852,453
     $
1,620,509