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Note 12 - Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements - December 31, 2021

 
      

Quoted

  

Significant

     
      

Prices

  

Other

  

Significant

 
      

in Active

  

Observable

  

Unobservable

 
  

Fair

  

Markets

  

Inputs

  

Inputs

 
  

Value

  

(Level 1)

  

(Level 2)

  

(Level 3)

 

Assets:

                

Interest rate swap

  163,378      163,378    

Total

 $163,378  $  $163,378  $ 
                 

Liabilities:

                

Natural gas purchases

 $2,082,631  $  $2,082,631  $ 

Interest rate swaps

  871,615      871,615    

Total

 $2,954,246  $  $2,954,246  $ 
  

Fair Value Measurements - September 30, 2021

 
      

Quoted

  

Significant

     
      

Prices

  

Other

  

Significant

 
      

in Active

  

Observable

  

Unobservable

 
  

Fair

  

Markets

  

Inputs

  

Inputs

 
  

Value

  

(Level 1)

  

(Level 2)

  

(Level 3)

 

Liabilities:

                

Natural gas purchases

 $2,728,935  $  $2,728,935  $ 

Interest rate swaps

  1,196,083      1,196,083    

Total

 $3,925,018  $  $3,925,018  $ 
Fair Value, by Balance Sheet Grouping [Table Text Block]
  

Fair Value Measurements - December 31, 2021

 
      

Quoted

  

Significant

     
      

Prices

  

Other

  

Significant

 
      

in Active

  

Observable

  

Unobservable

 
  

Carrying

  

Markets

  

Inputs

  

Inputs

 
  

Value

  

(Level 1)

  

(Level 2)

  

(Level 3)

 

Liabilities:

                

Current maturities of long-term debt

 $28,540,200        $28,680,537 

Notes payable

  105,500,000  $  $   112,866,499 

Total

 $134,040,200  $  $  $141,547,036 
  

Fair Value Measurements - September 30, 2021

 
      

Quoted

  

Significant

     
      

Prices

  

Other

  

Significant

 
      

in Active

  

Observable

  

Unobservable

 
  

Carrying

  

Markets

  

Inputs

  

Inputs

 
  

Value

  

(Level 1)

  

(Level 2)

  

(Level 3)

 

Liabilities:

                

Current maturities of long-term debt

 $7,000,000        $7,000,000 

Notes payable

 $116,110,200  $  $  $124,691,896 

Total

 $123,110,200  $  $  $131,691,896