STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from (for) operating activities
Net income (loss)	$ 15,314,831	$ (18,620,243)
Adjustments to reconcile net income (loss) to net cash from (for) operating activities
Net change in unrealized on futures, forwards and investments	3,458,190	(1,679,130)
(Increase) decrease in interest receivable	32,134	44,652
Increase (decrease) in accounts payable and accrued expenses	(47,957)	(298,747)
Purchases of investments	(987,762,547)	(1,455,244,647)
Sales/maturities of investments	993,911,342	1,505,994,835
Net cash from (for) operating activities	24,905,993	30,196,720
Cash flows from (for) financing activities
Redemption of units	(20,401,728)	(27,536,778)
Offering costs paid	(424,477)	(428,060)
Net cash from (for) financing activities	(20,826,205)	(27,964,838)
Net increase (decrease) in cash, cash equivalents and restricted cash	4,079,788	2,231,882
Cash, cash equivalents and restricted cash at beginning of period	28,167,754	25,795,630
Cash, cash equivalents and restricted cash at end of period	$ 32,247,542	$ 28,027,512