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QUARTERLY FINANCIAL DATA (Unaudited) (Quarterly Financial Information Presents The Results Of Operations) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Data [Line Items]                      
Total income (loss) $ 2,343,019 $ (673,185) $ 2,659,703 $ (1,337,347) $ (1,899,092) $ (1,873,104) $ 668,831 $ (1,302,350) $ 2,992,190 $ (4,405,715) $ (3,793,304)
Total expenses 59,503 61,441 53,295 50,619 53,441 57,295 64,099 56,985 224,858 231,820 307,583
Expense waivers (25,375) (28,986) (24,115) (23,616) (24,274) (23,085) (23,928) (17,835) 102,092 89,122 128,906
Net expenses 34,128 32,455 29,180 27,003 29,167 34,210 40,171 39,150 122,766 142,698 178,677
Net income (loss) $ 2,308,891 $ (705,640) $ 2,630,523 $ (1,364,350) $ (1,928,259) $ (1,907,314) $ 628,660 $ (1,341,500) $ 2,869,424 $ (4,548,413) $ (3,971,981)
Net income (loss) per share $ 1.61 $ (0.50) $ 1.9 $ (0.98) $ (1.56) $ (1.54) $ 0.22 $ (1.09) $ 2.03 $ (3.97) $ (4.63)