XML 47 R29.htm IDEA: XBRL DOCUMENT

CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total commissions accrued to brokers	$ 1,633	$ 1,231	$ 1,334
Total commissions as annualized percentage of average total net assets	0.03%	0.03%	0.02%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers	$ 1,153	$ 1,084	$ 823
Total commissions as annualized percentage of average total net assets	70.61%	88.06%	61.69%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers	$ 480	$ 147	$ 511
Total commissions as annualized percentage of average total net assets	29.39%	11.94%	38.31%