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Note 6 - Inventory (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
March 31,
 
 
December 31,
 
 
 
2017
 
 
2016
 
                 
                 
Finished goods
  $
190,653
    $
381,762
 
Fabricated assemblies
   
380,302
     
83,666
 
Total inventory
  $
570,955
    $
465,428