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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
Mar. 31, 2022
Dec. 31, 2021
Deferred compensation plan $ 11,210 $ 18,857
Non-current accounts receivable, net 11,211 11,531
Liabilities:    
Deferred compensation plan 8,457 9,339
Finance lease liabilities 16,553 16,919
Deferred compensation plan 11,210 18,857
Non-current accounts receivable, net 11,211 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 11,210 18,857
Non-current accounts receivable, net 11,211 11,531
Liabilities:    
Deferred compensation plan 8,457 9,339
Finance lease liabilities 16,553 16,919
Deferred compensation plan 11,210 18,857
Non-current accounts receivable, net 11,211 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