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QUARTERLY FINANCIAL DATA (Unaudited) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data (Unaudited)
Total Income (Loss)	$ 163,870,029	$ (80,441,230)	$ (22,663,248)	$ 424,069,433	$ (760,851,950)	$ 51,601,604	$ 256,619,443	$ 174,518,482	$ 484,834,984	$ (278,112,421)	$ 99,090,063
Total Expenses	2,499,980	2,777,247	2,930,288	3,171,765	3,032,675	3,117,304	3,391,637	3,620,608	11,379,280	13,162,224	20,117,666
Net income (loss)	$ 161,370,049	$ (83,218,477)	$ (25,593,536)	$ 420,897,668	$ (763,884,625)	$ 48,484,300	$ 253,227,806	$ 170,897,874	$ 473,455,704	$ (291,274,645)	$ 78,972,397
Net Income (Loss) per Share	$ 1.50	$ (0.85)	$ (0.37)	$ 2.91	$ (5.88)	$ 0.45	$ 1.92	$ 1.02	$ 3.19	$ (2.49)	$ 0.37

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