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Note 3 - Inventory (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
2018
   
December 31,
2017
 
Raw materials
  $
573,331
    $
582,816
 
Work in progress
   
517,027
     
453,890
 
Finished goods
   
746,308
     
810,040
 
Total
  $
1,836,666
    $
1,846,746