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Note 4 - Fair Value Measurements - Summary of Financial Assets and Liabilities Measured At Fair Value On a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred compensation plan $ 18,857  
Non-current accounts receivable, net 11,531 $ 11,321
Liabilities:    
Deferred compensation plan 9,339  
Finance lease liabilities 16,919 18,194
Non-current accounts receivable, net 11,531 11,321
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation plan 0  
Non-current accounts receivable, net 0 0
Liabilities:    
Deferred compensation plan 0  
Finance lease liabilities 0 0
Non-current accounts receivable, net 0 0
Fair Value, Inputs, Level 2 [Member]    
Deferred compensation plan 18,857  
Non-current accounts receivable, net 11,531 11,321
Liabilities:    
Deferred compensation plan 9,339  
Finance lease liabilities 16,919 18,194
Non-current accounts receivable, net 11,531 11,321
Fair Value, Inputs, Level 3 [Member]    
Deferred compensation plan 0  
Non-current accounts receivable, net 0 0
Liabilities:    
Deferred compensation plan 0  
Finance lease liabilities 0 0
Non-current accounts receivable, net $ 0 $ 0