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Inventories
3 Months Ended
Mar. 31, 2017
Inventories [Text Block]
4.

Inventories

   
 

Inventories as of December 31, 2016 and March 31, 2017 consisted of the following:


 

 

  December 31,     March 31,  
 

 

  2016     2017  
 

Raw materials

$ 2,570,942   $ 2,423,512  
 

Work in progress

  1,333,949     1,694,711  
 

Finished goods

  13,190,031     13,193,288  
 

 

$ 17,094,922   $ 17,311,511  

 

During the three months ended March 31, 2016 and 2017, write-downs of obsolete inventories to lower of cost or market of $96,910 and $150,156, respectively, were charged to cost of revenues.