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Note 13 - Employee Benefit Plans (Tables)
3 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended December 31,

 
  

2023

  

2022

 

Components of net periodic pension cost:

        

Service cost

 $81,066  $91,635 

Interest cost

  367,206   343,025 

Expected return on plan assets

  (294,958)  (308,149)

Recognized loss

  79,132   79,181 

Net periodic pension cost

 $232,446  $205,692 
  

Three Months Ended December 31,

 
  

2023

  

2022

 

Components of postretirement benefit cost:

        

Service cost

 $7,599  $11,475 

Interest cost

  153,369   155,156 

Expected return on plan assets

  (133,311)  (116,012)

Recognized gain

  (10,149)   

Net postretirement benefit cost

 $17,508  $50,619