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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
2017
   
20
16
 
                 
Raw materials
  $
2,549,016
    $
3,062,830
 
Work-in-process
   
389,630
     
159,482
 
Finished goods
   
26,977
     
64,227
 
Totals
  $
2,965,623
    $
3,286,539