Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Transportation and Distribution Revenue - Contract Assets and Liabilities (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Change In Contract With Customer, Asset [Roll Forward]  
Beginning Balance $ 180,579
Unrecognized Performance Obligations (209,157)
Recognized Performance Obligations 34,923
Ending Balance 6,345
Change In Contract With Customer, Liability [Roll Forward]  
Beginning Balance 6,522,354
Unrecognized Performance Obligations 0
Recognized Performance Obligations (137,796)
Ending Balance $ 6,384,558