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Note 5 - Inventories, Net (Tables)
3 Months Ended
Mar. 31, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2015
   
December 31, 2014
 
                 
                 
Raw materials
  $ 4,157,533     $ 4,307,913  
Work-in-process
    453,709       419,731  
Finished goods
    91,227       114,415  
Totals
  $ 4,702,469     $ 4,842,059