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Note 6 - Inventory
6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
INVENTORY
 
Inventory is stated at the lower of cost, determined on a
first
in,
first
out basis, or market, and consists primarily of fabricated assemblies and finished goods. Inventory is comprised of the following as of: 
 
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
                 
Finished goods
  $
341,264
    $
381,762
 
Fabricated assemblies
   
225,918
     
83,666
 
Total inventory
  $
567,182
    $
465,428