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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following:
 
September 30, 2019
   
December 31, 2018
 
                 
Dental finished goods, net   $
1,338,193
    $
1,609,000
 
Medical finished goods, net    
196,958
     
188,133
 
Component parts and other materials    
81,911
     
123,918
 
Total inventories
  $
1,617,062
    $
1,921,051