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Inventories (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Jewelry $ 7,240,241 $ 7,193,126
Scrap gold 784,413 885,194
Bullion 887,196 292,591
Rare coins and Other 267,690 1,013,225
Total $ 9,179,540 $ 9,384,136