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QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Line Items]
Total Income (Loss)	$ 17,689,246	$ 15,602,885	$ (8,631,948)	$ (8,301,247)	$ 9,627,887	$ (1,430,260)	$ 23,198,440	$ 6,608,262
Total Expenses	300,890	292,404	287,274	358,711	307,039	295,596	314,611	272,050
Expense Waivers	(81,105)	(66,850)	(63,219)	(120,259)	(50,753)	(43,026)	(36,554)	(59,762)	$ (331,433)	$ (190,095)	$ (135,317)
Net Expenses	219,785	225,554	224,055	238,452	256,286	252,570	278,057	212,288
Net Income (Loss)	$ 17,469,461	$ 15,377,331	$ (8,856,003)	$ (8,539,699)	$ 9,371,601	$ (1,682,830)	$ 22,920,383	$ 6,395,974	$ 15,451,090	$ 37,005,128	$ (43,645,160)
Net Income (Loss) per Share	$ 2.99	$ 2.22	$ (1.53)	$ (1.20)	$ 1.11	$ (0.27)	$ 2.55	$ 0.09	$ 2.48	$ 3.48	$ (10.17)

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