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Note 14 - Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2020
   
2019
 
Interest cost
  $
117
    $
150
 
Expected return on plan assets
   
(185
)    
(170
)
Amortization of loss
   
35
     
141
 
Net periodic pension expense
  $
(33
)   $
121