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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deferred compensation plan $ 5,871 $ 6,244
Derivatives, assets 42  
Total assets 5,913  
Derivatives, liabilities (45) (60)
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation plan 4,900 5,251
Derivatives, assets  
Total assets 4,900  
Derivatives, liabilities
Fair Value, Inputs, Level 2 [Member]    
Deferred compensation plan 971 993
Derivatives, assets 42  
Total assets 1,013  
Derivatives, liabilities (45) (60)
Fair Value, Inputs, Level 3 [Member]    
Deferred compensation plan
Derivatives, assets  
Total assets  
Derivatives, liabilities