Rates and Regulatory Matters (Details) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 24, 2020	Mar. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Additional revenues to reflect impact of WNA				$ 2,400,000
Heating degree day variance				16.50%
Roanoke Gas Company [Member]
Regulatory Liabilities [Line Items]
Additional write down of ESAC regulatory assets					$ 317,191
Rate refund paid		$ (3,800,000)
Regulatory liability, refund period (in years)			28 years
Roanoke Gas Company [Member] | General Rate Case [Member] | Virginia State Corporate Commission (SCC) [Member]
Regulatory Liabilities [Line Items]
Approved non-gas rate increase	$ 7,250,000