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ACCRUED EXPENSES (Tables)
6 Months Ended
Jun. 30, 2016
Payables and Accruals [Abstract]  
Schedule of accrued expenses
Accrued expenses consisted of the following:
 
June 30,
2016
 
December 31,
2015
Inventory-related accruals
$
764,093

 
$
548,800

Inventory supply and intermediation arrangements
248,345

 
252,380

Accrued transportation costs
78,236

 
91,546

Excise and sales tax payable
47,577

 
34,129

Renewable energy credit obligations
42,753

 
19,472

Accrued interest
30,701

 
22,313

Accrued utilities
20,546

 
25,192

Customer deposits
19,654

 
20,395

Accrued salaries and benefits
15,604

 
61,011

Accrued construction in progress
7,200

 
7,400

Other
29,062

 
34,797

Total accrued expenses
$
1,303,771

 
$
1,117,435