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Note 10 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
      

Significant

         
  

Quoted Prices

  

Other

  

Significant

     
  

in Active

  

Observable

  

Unobservable

     
  

Markets

  

Inputs

  

Inputs

     
  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Total

 

September 30, 2021

                

Assets:

                

Investments:

                

Cash surrender value of life insurance policies - deferred compensation plan

 $  $17,773  $  $17,773 

Marketable securities - other

  2         2 

Liabilities:

                

Deferred compensation plan

     18,144      18,144 

December 31, 2020

                

Assets:

                

Investments:

                

Cash surrender value of life insurance policies - deferred compensation plan

 $  $26,167  $  $26,167 

Marketable securities - other

  3         3 

Liabilities:

                

Deferred compensation plan

     20,271      20,271