Schedule of Investments (Unaudited) - Futures Contracts		9 Months Ended	12 Months Ended
		Sep. 30, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Schedule of Investments [Line Items]
Commodity Futures Contracts, Value		$ 168,076,866	$ 96,042,570
Long [Member] | Futures [Member] | COMEX Gold [Member] | Gold [Member]
Schedule of Investments [Line Items]
Commodity Futures Contracts, Number of Contracts | Contract		1,149	738
Commodity Futures Contracts, Expiration Date		Feb. 29, 2020	Feb. 28, 2019
Commodity Futures Contracts, Notional Value		$ 170,006,040	$ 94,559,940
Commodity Futures Contracts, Value	[1]	13,653,364	2,528,218
Commodity Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ 13,653,364	$ 2,528,218

[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.