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Inventories (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Inventories [Abstract]    
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 inventory $ 583,733 $ 521,745