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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total commissions accrued to brokers	$ 1,231	$ 1,334	$ 2,209
Total commissions as annualized percentage of average total net assets	0.03%	0.02%	0.02%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers	$ 1,084	$ 823	$ 1,605
Total commissions as annualized percentage of average total net assets	88.06%	61.69%	72.66%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers	$ 147	$ 511	$ 604
Total commissions as annualized percentage of average total net assets	11.94%	38.31%	27.34%