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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30, 2015
   
December 31, 2014
 
                 
Raw materials
  $ 2,976,123     $ 4,307,913  
Work-in-process
    579,540       419,731  
Finished goods
    91,227       114,415  
Totals
  $ 3,646,889     $ 4,842,059