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Note 5 - Defined Benefit Plan (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
  

Pension Benefits

 
  

Three Months Ended March, 31

 
  

2021

  

2020

 

Service cost

 $361  $270 

Interest cost

  184   205 

Expected return on plan assets

  (555

)

  (420

)

Amortization of prior service cost

  (3

)

  (27

)

Recognized net actuarial loss

  208   177 

Net periodic benefit cost

 $195  $205