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Note 13 - Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
      

Fair Value Measurements - September 30, 2023

 
      

Quoted Prices in Active Markets

  

Significant Other Observable Inputs

  

Significant Unobservable Inputs

 
  

Fair Value

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                

Interest rate swaps

 $4,617,455  $  $4,617,455  $ 

Total

 $4,617,455  $  $4,617,455  $ 
                 

Liabilities:

                

Natural gas purchases

 $1,022,662  $  $1,022,662  $ 

Total

 $1,022,662  $  $1,022,662  $ 
      

Fair Value Measurements - September 30, 2022

 
      

Quoted Prices in Active Markets

  

Significant Other Observable Inputs

  

Significant Unobservable Inputs

 
  

Fair Value

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                

Interest rate swaps

 $4,798,467  $  $4,798,467  $ 

Total

 $4,798,467  $  $4,798,467  $ 
                 

Liabilities:

                

Natural gas purchases

 $1,295,225  $  $1,295,225  $ 

Total

 $1,295,225  $  $1,295,225  $ 
Fair Value, by Balance Sheet Grouping [Table Text Block]
      

Fair Value Measurements - September 30, 2023

 
  

Carrying

  

Quoted Prices in Active Markets

  

Significant Other Observable Inputs

  

Significant Unobservable Inputs

 
  

Amount

  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

                

Current maturities of long-term debt

 $10,975,000  $  $  $10,975,000 

Notes payable

  126,100,000         120,298,658 

Total

 $137,075,000  $  $  $131,273,658 
      

Fair Value Measurements - September 30, 2022

 
  

Carrying

  

Quoted Prices in Active Markets

  

Significant Other Observable Inputs

  

Significant Unobservable Inputs

 
  

Amount

  

Level 1

  

Level 2

  

Level 3

 

Liabilities:

                

Current maturities of long-term debt

 $1,300,000  $  $  $1,300,000 

Notes payable

  135,971,200         130,266,252 

Total

 $137,271,200  $  $  $131,566,252