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Rates and Regulatory Matters (Details) - Roanoke Gas Company [Member] - USD ($)
3 Months Ended
Jan. 24, 2020
Nov. 26, 2019
Jun. 28, 2019
Oct. 10, 2018
Dec. 31, 2019
Regulatory Liabilities [Line Items]          
Additional write down of ESAC regulatory assets         $ 317,191
Regulatory liability, refund period (in years)         28 years
General Rate Case [Member] | Virginia State Corporate Commission (SCC) [Member]          
Regulatory Liabilities [Line Items]          
Requested non-gas rates increase       $ 10,500,000  
Recommended rate increase   $ 7,100,000 $ 6,500,000    
Subsequent Event [Member] | General Rate Case [Member] | Virginia State Corporate Commission (SCC) [Member]          
Regulatory Liabilities [Line Items]          
Approved non-gas rate increase $ 7,250,000