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Inventories - Schedule of Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Jewelry $ 6,708,671 $ 6,344,948
Scrap 970,934 1,512,156
Bullion 649,573 414,867
Rare coins and other 1,169,263 325,719
Inventories $ 9,498,441 $ 8,597,690