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Note 10 - Inventory
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Inventory Disclosure [Text Block]
10.
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:
 
   
March 31,
   
December 31,
 
   
2021
   
2020
 
                 
                 
Finished goods
  $
494,322
    $
221,130
 
Fabricated assemblies
   
106,125
     
109,817
 
Total inventory
  $
600,447
    $
330,947