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Note 7 - Long-term Debt (Tables)
 9 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Long-Term Debt Instruments [Table Text Block]
  

June 30, 2025

  

September 30, 2024

 
  

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  $89,300  $30,500,000  $96,541 

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

  8,000,000   10,836   8,000,000   14,448 

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

  10,000,000   18,013   10,000,000   20,362 

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

  10,000,000   15,852   10,000,000   18,494 

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   23,031   10,000,000   27,044 

Midstream:

                

Unsecured term note payable at Term SOFR plus 1.55%, due December 31, 2025

  25,000,000   12,919   24,855,000   32,299 

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

  14,000,000   2,408   14,000,000   4,213 

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 resumed April 1, 2025 (swap rate at 2.443% on designated principal)

  6,000,000   16,378   6,400,000   21,406 

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

  9,000,000   24,887   9,000,000   47,285 

Total long-term debt

  137,500,000   213,624   137,755,000   282,092 

Less: current maturities of long-term debt

  (2,534,514)  —   (800,000)  — 

Total long-term debt, net current maturities

 $134,965,486  $213,624  $136,955,000  $282,092