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Note 10 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 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

June 30, 2021

                

Assets:

                

Investments:

                

Cash surrender value of life insurance policies - deferred compensation plan

 $ $27,261 $ $27,261

Marketable securities - other

 2   2

Liabilities:

                

Deferred compensation plan

  20,185  20,185

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