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Gold and Silver Bullion - Bullion Holdings (Details) $ in Thousands	Jun. 30, 2018 USD ($) oz $ / oz	Dec. 31, 2017 USD ($) oz $ / oz
Schedule of Investments [Line Items]
Total carrying value	$ 3,664	$ 3,812
Gold
Schedule of Investments [Line Items]
Ounces | oz	1,904	1,905
Carrying value per ounce | $ / oz	1,250	1,291
Total carrying value	$ 2,380	$ 2,459
Silver
Schedule of Investments [Line Items]
Ounces | oz	80,099	80,224
Carrying value per ounce | $ / oz	16.03	16.87
Total carrying value	$ 1,284	$ 1,353

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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