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Note 7 - Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
   
December 31,
 
   
201
8
   
201
7
 
                 
Finished goods
  $
408,984
    $
487,858
 
Fabricated assemblies
   
521,494
     
458,989
 
Total inventory
  $
930,478
    $
946,847