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QUARTERLY FINANCIAL DATA (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summarized (unaudited) quarterly financial information
The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2018 and 2017.
 
 
 
First

Quarter

2018
 
 
Second

Quarter

2018
 
 
Third

Quarter

2018
 
 
Fourth

Quarter

2018
 
Total Income (Loss)
 
$
174,518,482
 
 
$
256,619,443
 
 
$
51,601,604
 
 
$
(760,851,950
)
Total Expenses
 
 
3,620,608
 
 
 
3,391,637
 
 
 
3,117,304
 
 
 
3,032,675
 
Net Income (Loss)
 
$
170,897,874
 
 
$
253,227,806
 
 
$
48,484,300
 
 
$
(763,884,625
)
Net Income (Loss) per Share
 
$
1.02
 
 
$
1.92
 
 
$
0.45
 
 
$
(5.88
)
 
 
 
First

Quarter

2017
 
 
Second

Quarter

2017
 
 
Third

Quarter

2017
 
 
Fourth

Quarter

2017
 
Total Income (Loss)
 
$
(247,892,752
)
 
$
(253,296,939
)
 
$
270,615,213
 
 
$
329,664,541
 
Total Expenses
 
 
5,262,552
 
 
 
5,476,212
 
 
 
4,805,332
 
 
 
4,573,570
 
Net Income (Loss)
 
$
(253,155,304
)
 
$
(258,773,151
)
 
$
265,809,881
 
 
$
325,090,971
 
Net Income (Loss) per Share
 
$
(1.09
)
 
$
(1.15
)
 
$
0.97
 
 
$
1.64