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Note 5 - Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2015
   
December 31, 2014
 
                 
Raw materials
  $ 3,536,268     $ 4,307,913  
Work-in-process
    576,666       419,731  
Finished goods
    91,947       114,415  
Totals
  $ 4,204,881     $ 4,842,059