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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
Jun. 30, 2022
Dec. 31, 2021
Deferred compensation plan $ 10,199 $ 18,857
Non-current accounts receivable, net 10,705 11,531
Liabilities:    
Deferred compensation plan 7,234 9,339
Finance lease liabilities 15,433 16,919
Deferred compensation plan 10,199 18,857
Non-current accounts receivable, net 10,705 11,531
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation plan 0 0
Non-current accounts receivable, net 0 0
Liabilities:    
Deferred compensation plan 0 0
Finance lease liabilities 0 0
Deferred compensation plan 0 0
Non-current accounts receivable, net 0 0
Fair Value, Inputs, Level 2 [Member]    
Deferred compensation plan 10,199 18,857
Non-current accounts receivable, net 10,705 11,531
Liabilities:    
Deferred compensation plan 7,234 9,339
Finance lease liabilities 15,433 16,919
Deferred compensation plan 10,199 18,857
Non-current accounts receivable, net 10,705 11,531
Fair Value, Inputs, Level 3 [Member]    
Deferred compensation plan 0 0
Non-current accounts receivable, net 0 0
Liabilities:    
Deferred compensation plan 0 0
Finance lease liabilities 0 0
Deferred compensation plan 0 0
Non-current accounts receivable, net $ 0 $ 0