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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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