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Note 15 - Employee Benefit Plans (Tables)
3 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended December 31,

 
  

2024

  

2023

 

Components of net periodic pension cost:

        

Service cost

 $96,858  $81,066 

Interest cost

  352,602   367,206 

Expected return on plan assets

  (375,976)  (294,958)

Recognized loss

  14,857   79,132 

Net periodic pension cost

 $88,341  $232,446 
  

Three Months Ended December 31,

 
  

2024

  

2023

 

Components of postretirement benefit cost:

        

Service cost

 $1,095  $7,599 

Interest cost

  126,856   153,369 

Expected return on plan assets

  (182,430)  (133,311)

Recognized gain

  (58,153)  (10,149)

Net postretirement benefit cost

 $(112,632) $17,508