Annual report pursuant to Section 13 and 15(d)

Transportation and Distribution Revenue - Additional Information (Details)

v3.10.0.1
Transportation and Distribution Revenue - Additional Information (Details) - USD ($)
11 Months Ended 12 Months Ended 143 Months Ended
Jan. 01, 2018
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 3,307,109      
Remaining performance obligation     $ 63,500,000      
Natural gas transportation contracts | Product and services | Revenue            
Concentration Risk [Line Items]            
Concentration percentage     64.30% 71.50% 67.60%  
Natural gas distribution contracts | Product and services | Revenue            
Concentration Risk [Line Items]            
Concentration percentage     26.80% 20.40% 19.00%  
Forecast            
Concentration Risk [Line Items]            
Recognized performance obligations quarterly           $ 138,000