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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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