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Note 11 - Retirement Fund and Profit Sharing Plan (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Three Months Ended

  

Nine Months Ended

 
  

September 30,

  

September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Service cost

 $150  $144  $450  $432 

Interest cost

  159   185   477   555 

Net amortization

  86   48   258   144 

Net periodic benefit cost

 $395  $377  $1,185  $1,131 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
  

September 30,

  

December 31,

 
  

2020

  

2019

 

Prior service cost

 $624  $738 

Net loss

  1,821   1,965 
  $2,445  $2,703