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Note 15 - Employee Benefit Plans (Tables)
9 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended June 30,

  

Nine Months Ended June 30,

 
  

2025

  

2024

  

2025

  

2024

 

Components of net periodic pension cost:

                

Service cost

 $96,858  $81,066  $290,574  $243,198 

Interest cost

  352,602   367,206   1,057,806   1,101,618 

Expected return on plan assets

  (375,976)  (294,958)  (1,127,928)  (884,874)

Recognized loss

  14,857   79,132   44,571   237,396 

Net periodic pension cost

 $88,341  $232,446  $265,023  $697,338 
  

Three Months Ended June 30,

  

Nine Months Ended June 30,

 
  

2025

  

2024

  

2025

  

2024

 

Components of postretirement benefit cost:

                

Service cost

 $1,095  $7,599  $3,285  $22,797 

Interest cost

  126,856   153,369   380,568   460,107 

Expected return on plan assets

  (182,430)  (133,311)  (547,290)  (399,933)

Recognized gain

  (58,153)  (10,149)  (174,459)  (30,447)

Net postretirement benefit cost

 $(112,632) $17,508  $(337,896) $52,524