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Note 7 - Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
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