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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Deferred compensation plan $ 5,020 $ 5,075
Derivatives, assets
Total assets 5,020 5,075
Financial liabilities    
Contingent consideration
Derivatives, liabilities  
Total liabilities  
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Deferred compensation plan 1,342 1,282
Derivatives, assets 7 296
Total assets 1,349 1,578
Financial liabilities    
Contingent consideration
Derivatives, liabilities (105)  
Total liabilities (105)  
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Deferred compensation plan
Derivatives, assets
Total assets
Financial liabilities    
Contingent consideration (698) (2,974)
Derivatives, liabilities  
Total liabilities (698)  
Deferred compensation plan 6,362 6,357
Derivatives, assets 7 296
Total assets 6,369 6,653
Contingent consideration (698) $ (2,974)
Derivatives, liabilities (105)  
Total liabilities $ (803)