Quarterly report pursuant to Section 13 or 15(d)

Transportation and Distribution Revenue - Additional Information (Details)

v3.10.0.1
Transportation and Distribution Revenue - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 143 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2030
Concentration Risk [Line Items]            
Cumulative Transition Adjustment Upon Adoption of ASC 606 $ 3,300,000     $ 3,307,109    
Unrecognized performance obligations   $ 992,000   2,976,399    
Remaining performance obligation   $ 64,800,000   $ 64,800,000    
Natural Gas Transportation Contract [Member] | Product and services [Member] | Revenue [Member]            
Concentration Risk [Line Items]            
Concentration percentage   60.30% 67.20% 64.20% 70.90%  
Natural Gas Distribution Contract [Member] | Product and services [Member] | Revenue [Member]            
Concentration Risk [Line Items]            
Concentration percentage   24.80% 19.30% 26.10% 20.20%  
Forecast [Member]            
Concentration Risk [Line Items]            
Recognized performance obligations quarterly           $ 138,000