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QUARTERLY FINANCIAL DATA (Unaudited) (Summarized Quarterly Financial Information (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 Information [Line Items]
Total Income (Loss)	$ 13,164,906	$ 10,047,404	$ (9,670,343)	$ (10,890,297)	$ 11,414,019	$ (2,704,986)	$ 19,948,048	$ 1,522,157	$ 2,651,670	$ 30,179,238	$ (27,379,440)
Total Expenses	233,160	214,528	225,381	256,646	222,565	206,706	208,254	168,348	929,715	805,873	575,506
Net Income (Loss)	$ 12,931,746	$ 9,832,876	$ (9,895,724)	$ (11,146,943)	$ 11,191,454	$ (2,911,692)	$ 19,739,794	$ 1,353,809	$ 1,721,955	$ 29,373,365	$ (27,954,946)
Net Income (Loss) per Share	$ 2.74	$ 1.52	$ (1.73)	$ (1.87)	$ 1.64	$ (0.59)	$ 2.99	$ (0.65)	$ 0.66	$ 3.39	$ (9.59)

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