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LEASES (Tables)
 6 Months Ended
Jun. 30, 2019
Leases [Abstract]  
Schedule of maturities of operating lease liabilities
Maturities of our lease liabilities for all operating leases are as follows as of June 30, 2019:

 
Facilities
 
Equipment
 
Plant
 
Railcar
 
Total
Year 1
$
767,133

 
$
161,539

 
$
4,060,417

 
$
1,153,911

 
$
6,143,000

Year 2
541,970

 
161,539

 
4,060,417

 
815,916

 
5,579,842

Year 3
413,512

 
107,723

 
4,060,417

 
204,606

 
4,786,258

Year 4
324,000

 
—

 
4,060,417

 
8,946

 
4,393,363

Year 5
300,000

 
—

 
4,060,417

 
—

 
4,360,417

Thereafter
2,525,000

 
—

 
35,555,115

 
—

 
38,080,115

Total lease payments
$
4,871,615

 
$
430,801

 
$
55,857,200

 
$
2,183,379

 
$
63,342,995

Less: interest
(1,803,111
)
 
(33,654
)
 
(24,431,399
)
 
(163,486
)
 
(26,431,650
)
Present value of lease liabilities
$
3,068,504

 
$
397,147

 
$
31,425,801

 
$
2,019,893

 
$
36,911,345
Schedule of operating lease weighted average remaining lease terms and discount rates
The weighted average remaining lease terms and discount rates for all of our operating leases were as follows as of June 30, 2019:
Remaining lease term and discount rate:
 
June 30, 2019
Weighted average remaining lease terms (years)
 
 
   Lease facilities
 
5.76

   Lease equipment
 
2.67

   Lease plant
 
13.76

   Lease railcar
 
1.87

Weighted average discount rate
 
 
   Lease facilities
 
9.10
%
   Lease equipment
 
8.00
%
   Lease plant
 
9.37
%
   Lease railcar
 
8.00
%