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 6 Months Ended 143 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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   1,984,266    
Remaining performance obligation   $ 66,200,000   $ 66,200,000    
Natural Gas Transportation Contract [Member] | Product and services [Member] | Revenue [Member]            
Concentration Risk [Line Items]            
Concentration percentage   66.10% 74.10% 66.30% 72.90%  
Natural Gas Distribution Contract [Member] | Product and services [Member] | Revenue [Member]            
Concentration Risk [Line Items]            
Concentration percentage   27.20% 21.40% 26.80% 20.70%  
Forecast [Member]            
Concentration Risk [Line Items]            
Recognized performance obligations quarterly           $ 138,000