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Note 3 - Inventories (Tables)
3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] As of March 31, 2016 and December 31, 2015, inventories consisted of the following:

 
 
March 31,
2016
   
December 31,
2015
 
 
           
Raw materials
 
$
325,530
   
$
311,751
 
Work in progress
   
1,084,981
     
1,753,090
 
Finished goods
   
3,162,388
     
3,189,188
 
 
 
$
4,572,899
   
$
5,254,029