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Note 7 - Inventory
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
7.
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,
 
   
201
9
   
201
8
 
                 
                 
Finished goods
  $
476,418
    $
496,358
 
Fabricated assemblies
   
504,490
     
502,471
 
Total inventory
  $
980,908
    $
998,829