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Note 14 - Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Interest cost

 $117  $153  $351  $453 

Expected return on plan assets

  (185)  (169)  (556)  (508)

Amortization of loss

  36   (176)  107   106 

Net periodic pension expense

 $(32) $(192) $(98) $51