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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, 2017
Dec. 31, 2016
Deferred compensation plan $ 6,244 $ 6,209
Derivatives, liabilities (60) (8)
Derivatives, assets   58
Total assets   6,267
Fair Value, Inputs, Level 1 [Member]    
Deferred compensation plan 5,251 5,215
Derivatives, liabilities
Derivatives, assets  
Total assets   5,215
Fair Value, Inputs, Level 2 [Member]    
Deferred compensation plan 993 994
Derivatives, liabilities (60) (8)
Derivatives, assets   58
Total assets   1,052
Fair Value, Inputs, Level 3 [Member]    
Deferred compensation plan
Derivatives, liabilities
Derivatives, assets  
Total assets