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Note 7 - Long-term Debt (Tables)
 9 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Long-Term Debt Instruments [Table Text Block]
  

June 30, 2024

  

September 30, 2023

 
  

Principal

  

Unamortized Debt Issuance Costs

  

Principal

  

Unamortized Debt Issuance Costs

 

Roanoke Gas:

                

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

 $30,500,000  $98,954  $30,500,000  $106,195 

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

  8,000,000   15,652   8,000,000   19,264 

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

  10,000,000   21,145   10,000,000   23,495 

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

  10,000,000   19,375   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   28,784   10,000,000   33,666 

Midstream:

                

Unsecured term note payable at Term SOFR plus 1.75%, due December 31, 2025

  24,115,000   38,758   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   4,815   14,000,000   6,621 

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

  —   —   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, were suspended April 1, 2024, and will resume April 1, 2025 (swap rate at 2.443% on designated principal)

  6,400,000   23,082   7,200,000   19,057 

Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026

  9,000,000   53,087   —   — 

Total long-term debt

  137,015,000   303,652   137,075,000   255,272 

Less: current maturities of long-term debt

  (400,000)  —   (10,975,000)  — 

Total long-term debt, net current maturities

 $136,615,000  $303,652  $126,100,000  $255,272