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Note 7 - Inventory (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
201
8
   
201
7
 
                 
                 
Finished goods
  $
435,191
    $
487,858
 
Fabricated assemblies
   
463,969
     
458,989
 
Total inventory
  $
899,160
    $
946,847