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Note 10 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred compensation plan $ 4,717 $ 5,150
Foreign currency forward contracts (1,150) (138)
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation plan 3,884 4,268
Foreign currency forward contracts 0 0
Fair Value, Inputs, Level 2 [Member]    
Deferred compensation plan 833 882
Foreign currency forward contracts (1,150) (138)
Fair Value, Inputs, Level 3 [Member]    
Deferred compensation plan 0 0
Foreign currency forward contracts $ 0 $ 0