Quarterly report pursuant to Section 13 or 15(d)

Transportation and Distribution Revenue - Contract Assets and Liabilities (Details)

v3.19.3
Transportation and Distribution Revenue - Contract Assets and Liabilities (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
Change In Contract With Customer, Liability [Roll Forward]  
Beginning Balance $ 6,552,049
Ending Balance 6,511,572
Transportation and distribution revenue  
Change In Contract With Customer, Liability [Roll Forward]  
Beginning Balance 6,522,354
Unrecognized Performance Obligations 381,858
Recognized Performance Obligations (413,389)
Ending Balance $ 6,490,823