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Note 9 - Long-term Debt (Tables)
 3 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Long-Term Debt Instruments [Table Text Block]
  

December 31, 2023

  

September 30, 2023

 
  

Principal

  

Unamortized Debt Issuance Costs

  

Principal

  

Unamortized Debt Issuance Costs

 

Roanoke Gas:

                

Unsecured senior notes payable at 4.26%, due September 18, 2034

 $30,500,000  $103,782  $30,500,000  $106,195 

Unsecured term notes payable at 3.58%, due October 2, 2027

  8,000,000   18,060   8,000,000   19,264 

Unsecured term notes payable at 4.41%, due March 28, 2031

  10,000,000   22,711   10,000,000   23,495 

Unsecured term notes payable at 3.60%, due December 6, 2029

  10,000,000   21,136   10,000,000   22,017 

Unsecured term note payable at 30-day SOFR plus 1.20%, due August 20, 2026 (swap rate at 2.00%)

  15,000,000   —   15,000,000   — 

Unsecured term note payable at Term SOFR plus 1.00%, due October 1, 2028 (swap rate at 2.49%)

  10,000,000   31,983   10,000,000   33,666 

Midstream:

                

Unsecured term notes payable at Term SOFR plus 2.00%, due December 31, 2024

  23,000,000   16,217   23,000,000   23,386 

Unsecured term note payable at Daily Simple SOFR plus 1.26448%, due June 12, 2026 (swap rate at 3.24%)

  14,000,000   6,019   14,000,000   6,621 

Unsecured term note payable at 30-day LIBOR plus 1.20%, due June 1, 2024 with monthly principal installments of $41,667 that began July 1, 2022 (swap rate at 3.14%)

  9,250,000   982   9,375,000   1,571 

Unsecured term note payable at Daily Simple SOFR plus 1.26448%, due January 1, 2028 with quarterly principal installments of $400,000 that began April 1, 2023 (swap rate at 2.443%)

  6,800,000   17,914   7,200,000   19,057 

Total long-term debt

  136,550,000   238,804   137,075,000   255,272 

Less: current maturities of long-term debt

  (33,850,000)  —   (10,975,000)  — 

Total long-term debt, net current maturities

 $102,700,000  $238,804  $126,100,000  $255,272