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

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Service cost

 $169  $150  $339  $300 

Interest cost

  135   159   270   318 

Net amortization

  127   86   255   172 

Net periodic benefit cost

 $431  $395  $864  $790 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
  

June 30,

  

December 31,

 
  

2021

  

2020

 

Prior service cost

 $523  $586 

Net loss

  1,582   1,773 
  $2,105  $2,359