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Note 8 - Inventory
6 Months Ended
Jun. 30, 2020
Notes to Financial Statements  
Inventory Disclosure [Text Block]
8.
INVENTORY
 
Inventory is stated at the lower of cost, determined on a
first
in,
first
out basis, or net realizable value, and consists primarily of fabricated assemblies and finished goods. Inventory is comprised of the following as of: 
 
   
June 30,
   
December 31,
 
   
2020
   
2019
 
                 
Finished goods
  $
247,540
    $
287,761
 
Fabricated assemblies
   
141,358
     
141,358
 
Total inventory
  $
388,898
    $
429,119