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Note 7 - Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   

Three Months Ended

September 30,

 
   

2019

   

2018

 

Service cost

  $ 1,100     $ 1,252  

Interest cost

    1,620       1,377  

Expected return on plan assets

    (1,496

)

    (1,634

)

Amortization of prior service cost

    15       15  

Amortization of net loss

    1,097       931  

Net periodic pension cost

  $ 2,336     $ 1,941  
   

Nine Months Ended

September 30,

 
   

2019

   

2018

 

Service cost

  $ 3,300     $ 3,756  

Interest cost

    4,860       4,131  

Expected return on plan assets

    (4,488

)

    (4,902

)

Amortization of prior service cost

    45       45  

Amortization of net loss

    3,291       2,793  

Net periodic pension cost

  $ 7,008     $ 5,823