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

September 30

 
  

2025

  

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  $86,887  $30,500,000  $96,541 

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

  8,000,000   9,632   8,000,000   14,448 

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

  10,000,000   17,229   10,000,000   20,362 

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

  10,000,000   14,971   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   22,612   10,000,000   27,044 

Midstream:

                

Unsecured term note payable at Term SOFR plus 1.55%, due September 5, 2032 ($14M swap rate at 3.24%, $4M swap rate at 2.443%, and $20.6M swap rate at 5.061%)

  38,600,000   171,362   —   — 

Unsecured term note payable at Term SOFR plus 1.55%, due September 5, 2032 (swap rate at 5.061%)

  15,000,000   66,592   —   — 

Revolving credit facility at Term SOFR plus 1.75%, due September 5, 2030 ("Southgate")

  4,215   5,553   —   — 

Revolving credit facility at Term SOFR plus 1.75%, due September 5, 2030 ("Boost")

  —   10,956   —   — 

Unsecured term note payable at Term SOFR plus 1.55%, retired September 5, 2025

  —   —   24,855,000   32,299 

Unsecured term note payable at Daily Simple SOFR plus 1.26448% (swap rate at 3.24%), retired September 5, 2025

  —   —   14,000,000   4,213 

Unsecured term note payable at Daily Simple SOFR plus 1.26448% (swap rate at 2.443% on designated principal), retired September 5, 2025

  —   —   6,400,000   21,406 

Revolving credit facility at Daily Simple SOFR plus 2.215%, retired September 5, 2025

  —   —   9,000,000   47,285 

Total long-term debt

 $137,104,215  $405,794  $137,755,000  $282,092 

Less: current maturities of long-term debt

  (2,846,018)  —   (800,000)  — 

Total long-term debt, net current maturities

 $134,258,197  $405,794  $136,955,000  $282,092 
Schedule of Maturities of Long-Term Debt [Table Text Block]

Year Ending September 30

 

Maturities

 

2026

 $17,846,018 

2027

  2,846,018 

2028

  10,846,017 

2029

  12,846,018 

2030

  12,850,233 

Thereafter

  79,869,911 

Total

 $137,104,215