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Note 11 - Retirement Fund and Profit Sharing Plan (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2020
   
2019
 
Service cost
  $
150
    $
144
 
Interest cost
   
159
     
185
 
Net amortization
   
86
     
48
 
Net periodic benefit cost
  $
395
    $
377
 
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
Prior service cost
  $
700
    $
738
 
Net loss
   
1,918
     
1,965
 
    $
2,618
    $
2,703