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QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Line Items]
Total Income (Loss)	$ (38,543,348)	$ 4,932,679	$ 14,513,797	$ 4,772,682	$ 17,689,246	$ 15,602,885	$ (8,631,948)	$ (8,301,247)
Total Expenses	214,103	227,009	237,273	269,461	300,890	292,404	287,274	358,711
Expense Waivers	(3,584)	(599)	(18,291)	(59,168)	(81,105)	(66,850)	(63,219)	(120,259)	$ 81,642	$ 331,433	$ 190,095
Net Expenses	210,519	226,410	218,982	210,293	219,785	225,554	224,055	238,452
Net Income (Loss)	$ (38,753,867)	$ 4,706,269	$ 14,294,815	$ 4,562,389	$ 17,469,461	$ 15,377,331	$ (8,856,003)	$ (8,539,699)	$ (15,190,394)	$ 15,451,090	$ 37,005,128
Net Income (Loss) per Share	$ (8.10)	$ 1.07	$ 3.08	$ 0.95	$ 2.99	$ 2.22	$ (1.53)	$ (1.20)	$ (3.00)	$ 2.48	$ 3.48

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