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Inventories (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Jewelry $ 6,789,259 $ 7,193,126
Scrap gold 711,524 885,194
Bullion 586,251 292,591
Rare coins and Other 489,559 1,013,225
Total $ 8,576,593 $ 9,384,136