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Note 4 - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Deferred compensation plan $ 5,025 $ 5,075
Derivative assets  
Total assets   5,075
Financial liabilities    
Contingent consideration
Derivative liabilities  
Total liabilities  
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Deferred compensation plan 1,333 1,282
Derivative assets   296
Total assets   1,578
Financial liabilities    
Contingent consideration
Derivative liabilities (250)  
Total liabilities (250)  
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Deferred compensation plan
Derivative assets  
Total assets  
Financial liabilities    
Contingent consideration (1,142) (2,974)
Derivative liabilities  
Total liabilities (1,142)  
Deferred compensation plan 6,358 6,357
Derivative assets   296
Total assets   6,653
Contingent consideration (1,142) $ (2,974)
Derivative liabilities (250)  
Total liabilities $ (1,392)