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Note 7 - Pension and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Costs of Retirement Plans [Table Text Block]
  

Pension Benefits

  

Postretirement Benefits

 
  

Three Months Ended
September 30,

  

Three Months Ended
September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Service cost

 $688  $551  $343  $271 

Interest cost

  431   614   194   235 

Expected return on plan assets

  (984)  (890

)

  -   - 

Amortization of prior service cost

  -   -   (282)  (282

)

Recognized actuarial loss

  538   431   77   7 

Settlement loss

  991   -   -   - 

Net periodic benefit cost (a)

 $1,664  $706  $332  $231 
  

Pension Benefits

  

Postretirement Benefits

 
  

Nine Months Ended
September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Service cost

 $2,029  $1,653  $1,029  $812 

Interest cost

  1,522   1,841   584   706 

Expected return on plan assets

  (2,928)  (2,671

)

  -   - 

Amortization of prior service cost

  -   -   (847)  (846

)

Recognized actuarial loss

  1,673   1,294   230   21 

Settlement loss

  4,373   -   -   - 

Net periodic benefit cost (a)

 $6,669  $2,117  $996  $693