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QUARTERLY FINANCIAL DATA (Unaudited) (Details) - 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 [Abstract]
Total Income (Loss)	$ 11,874,459	$ (4,665,987)	$ 246,345	$ 20,095,714	$ (38,543,348)	$ 4,932,679	$ 14,513,797	$ 4,772,682
Total Expenses	217,511	230,753	213,774	205,258	214,103	227,009	237,273	269,461
Expense Waivers	(35,280)	(35,357)	(3,391)	(6,004)	(3,584)	(599)	(18,291)	(59,168)	$ 80,032	$ 81,642	$ 331,433
Net Expenses	182,231	195,396	210,383	199,254	210,519	226,410	218,982	210,293
Net Income (Loss)	$ 11,692,228	$ (4,861,383)	$ 35,962	$ 19,896,460	$ (38,753,867)	$ 4,706,269	$ 14,294,815	$ 4,562,389	$ 26,763,267	$ (15,190,394)	$ 15,451,090
Net Income (Loss) per Share	$ 2.82	$ (1.04)	$ (0.09)	$ 4.04	$ (8.10)	$ 1.07	$ 3.08	$ 0.95	$ 5.73	$ (3.00)	$ 2.48

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