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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
1 Months Ended 6 Months Ended
Mar. 26, 2018
Dec. 31, 2015
Mar. 31, 2018
Oct. 02, 2017
Sep. 30, 2017
Debt Instrument [Line Items]          
Notes payable     $ 55,763,200   $ 43,812,200
Principal     55,763,200   61,603,960
Unamortized Debt Issuance Costs     272,884   291,949
Notes Payable [Member]          
Debt Instrument [Line Items]          
Notes payable     55,763,200   43,812,200
Unamortized Debt Issuance Costs     272,884   291,949
Roanoke Gas Company [Member] | Unsecured Senior Notes [Member] | Unsecured Senior Notes Payable, at 4.26%, due on September 18, 2034 [Member]          
Debt Instrument [Line Items]          
Notes payable     30,500,000   30,500,000
Unamortized Debt Issuance Costs     $ 159,292   164,119
Stated percentage rate     4.26%    
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member]          
Debt Instrument [Line Items]          
Notes payable     $ 7,000,000   7,000,000
Unamortized Debt Issuance Costs     $ 11,950   13,618
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] | 30-day LIBOR [Member]          
Debt Instrument [Line Items]          
Variable rate basis points (as a percent)     0.90%    
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.58%, due October 2, 2027 [Member]          
Debt Instrument [Line Items]          
Notes payable     $ 8,000,000   0
Unamortized Debt Issuance Costs     $ 45,752   48,160
Stated percentage rate     3.58% 3.58%  
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2020 [Member]          
Debt Instrument [Line Items]          
Line-of-credit     $ 0   17,791,760
Unamortized Debt Issuance Costs     $ 0   0
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2020 [Member] | 30-day LIBOR [Member]          
Debt Instrument [Line Items]          
Variable rate basis points (as a percent) 1.00%   1.00%    
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.60%, due December 29, 2020 [Member]          
Debt Instrument [Line Items]          
Notes payable     $ 10,263,200   6,312,200
Unamortized Debt Issuance Costs     $ 55,890   $ 66,052
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.60%, due December 29, 2020 [Member] | 30-day LIBOR [Member]          
Debt Instrument [Line Items]          
Variable rate basis points (as a percent)   1.60% 1.60%