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Note 9 - Long-term Debt (Tables)
 6 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Long-Term Debt Instruments [Table Text Block]
  

March 31, 2022

  

September 30, 2021

 
  

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  $120,676  $30,500,000  $125,502 

Unsecured term note payable, at 30-day LIBOR plus 0.90%, due November 1, 2021

  —   —   7,000,000   278 

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

  8,000,000   26,488   8,000,000   28,896 

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

  10,000,000   28,193   10,000,000   29,760 

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

  10,000,000   27,301   10,000,000   29,062 

Unsecured term note payable, at 30-day SOFR plus 1.20%, due August 20, 2026

  15,000,000   —   —   — 

Unsecured delayed draw note payable

  —   31,064   —   21,545 

Midstream:

                

Unsecured term notes payable, at 30-day LIBOR plus 1.35%, due December 29, 2022

  19,330,200   8,942   33,610,200   14,904 

Unsecured term note payable, at 30-day LIBOR plus 1.15%, due June 12, 2026

  14,000,000   10,233   14,000,000   11,437 

Unsecured term note payable, at 30-day LIBOR plus 1.20%, due June 1, 2024

  10,000,000   5,107   10,000,000   6,286 

Unsecured term note payable, at 30-day LIBOR plus 1.15%, due January 1, 2028

  8,000,000   25,918   —   — 

Total notes payable, current and non-current

  124,830,200   283,922   123,110,200   267,670 

Line-of-credit, at 30-day LIBOR plus 1.00%, due March 31, 2023

  —   —   17,628,897   — 

Total long-term debt

  124,830,200   283,922   140,739,097   267,670 

Less: current maturities of long-term debt

  (19,705,200)  —   (7,000,000)  — 

Total long-term debt, net current maturities

 $105,125,000  $283,922  $133,739,097  $267,670