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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total commissions accrued to brokers	$ 537	$ 312	$ 1,058	$ 948
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			$ 767	$ 850
Total commissions as annualized percentage of average total net assets	72.50%	89.66%	72.50%	89.66%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers			$ 291	$ 98
Total commissions as annualized percentage of average total net assets	27.50%	10.34%	27.50%	10.34%