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Note 6 - Inventory (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
                 
Finished goods
  $
341,264
    $
381,762
 
Fabricated assemblies
   
225,918
     
83,666
 
Total inventory
  $
567,182
    $
465,428