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Note 6 - Inventory (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
30,
   
December 31,
 
   
2017
   
2016
 
                 
Finished goods
  $
470,544
    $
381,762
 
Fabricated assemblies
   
409,048
     
83,666
 
Total inventory
  $
879,592
    $
465,428