Schedule of Investments (Unaudited) - Futures Contracts - Futures [Member]		6 Months Ended	12 Months Ended
		Jun. 30, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) Contract
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		(8.76%)	(6.41%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (1,798,035)	$ (1,599,451)
Notional Value		$ 20,496,700	$ 24,942,840
Silver [Member] | CME SWAPS MARKETS (COMEX) [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		(8.76%)	(6.41%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (1,798,035)	$ (1,599,451)
Notional Value		$ 20,496,700	$ 24,942,840
Number of Contracts | Contract		245	312
Maturity Date		Dec. 27, 2017	Mar. 29, 2017

[1] Unrealized appreciation/(depreciation) is presented above, net by contract.