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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total commissions accrued to brokers	$ 631	$ 537	$ 2,181	$ 1,058
Total commissions as annualized percentage of average total net assets	0.03%	0.03%	0.03%	0.03%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers			$ 1,525	$ 767
Total commissions as annualized percentage of average total net assets	69.92%	72.50%	69.92%	72.50%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers			$ 656	$ 291
Total commissions as annualized percentage of average total net assets	30.08%	27.50%	30.08%	27.50%