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Note 11 - Retirement Fund and Profit Sharing Plan (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Service cost

 $169  $150  $508  $450 

Interest cost

  135   159   405   477 

Net amortization

  127   86   382   258 

Net periodic benefit cost

 $431  $395  $1,295  $1,185 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
  

September 30,

  

December 31,

 
  

2021

  

2020

 

Prior service cost

 $492  $586 

Net loss

  1,487   1,773 
  $1,979  $2,359