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Long-Term Debt (Tables)
9 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Long-term debt consists of the following:
June 30, 2020September 30, 2019
PrincipalUnamortized Debt Issuance CostsPrincipalUnamortized Debt Issuance Costs
Roanoke Gas Company:
Unsecured senior notes payable, at 4.26% due on September 18, 2034$30,500,000  $137,570  $30,500,000  $144,811  
Unsecured term note payable, at 30-day LIBOR plus 0.90%, due November 1, 20217,000,000  4,447  7,000,000  6,948  
Unsecured term notes payable, at 3.58% due on October 2, 20278,000,000  34,916  8,000,000  38,528  
Unsecured term notes payable, at 4.41% due on March 28, 203110,000,000  33,675  10,000,000  36,272  
Unsecured term notes payable, at 3.60% due on December 6, 202910,000,000  33,466  —  —  
RGC Midstream, LLC:
Unsecured term notes payable, at 30-day LIBOR plus 1.35%, due December 29, 202224,310,200  53,610  16,012,200  59,504  
Unsecured term note payable, at 30-day LIBOR plus 1.15%, due June 12, 202614,000,000  14,446  14,000,000  16,252  
Unsecured term note payable, at 30-day LIBOR plus 1.20%, due June 1, 202410,000,000  9,233  10,000,000  11,000  
Total notes payable$113,810,200  $321,363  $95,512,200  $313,315  
Line-of-credit, at 30-day LIBOR plus 1.00%, due March 31, 2022$2,858,130  $—  $8,172,473  $—  
Total long-term debt $116,668,330  $321,363  $103,684,673  $313,315