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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Interest cost

 $117  $150  $234  $300 

Expected return on plan assets

  (186)  (169)  (371)  (339)

Amortization of loss

  36   141   71   282 

Net periodic pension expense

 $(33) $122  $(66) $243