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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
2015
   
2014
 
                 
Raw materials
  $ 2,718,328     $ 4,307,913  
Work-in-process
    174,698       419,731  
Finished goods
    93,404       114,415  
Totals
  $ 2,986,430     $ 4,842,059