XML 20 R8.htm IDEA: XBRL DOCUMENT v3.7.0.1
Inventories
 6 Months Ended
Jun. 30, 2017
Inventories [Abstract]  
Inventories

3.  Inventories



Inventories consist of the following:







 

 

 

 

 

 



 

 

 

 

 

 



 

June 30,

 

December 31,



 

2017

 

2016

Raw materials

 

$

 799,698 

 

$

 1,027,474 

Work-in-process

 

 

 624,983 

 

 

 537,858 

Finished goods

 

 

 1,829,583 

 

 

 1,494,753 

Total

 

$

 3,254,264 

 

$

 3,060,085 



Silver included in raw materials, work-in-process and finished goods inventory had an estimated cost of $583,733 and $521,745 as of June 30, 2017 and December 31, 2016, respectively.