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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30, 2016
   
December 31, 2015
 
                 
Raw materials
  $ 2,862,560     $ 2,718,328  
Work-in-process
    123,972       174,698  
Finished goods
    64,226       93,404  
Totals
  $ 3,050,758     $ 2,986,430