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Note 8 - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Deferred compensation plan $ 5,075 $ 4,953
Derivatives
Total assets $ 5,075 $ 4,953
Financial liabilities    
Contingent consideration
Derivatives  
Total liabilities  
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Deferred compensation plan $ 1,282 $ 1,284
Derivatives 296 32
Total assets $ 1,578 $ 1,316
Financial liabilities    
Contingent consideration
Derivatives   $ (5)
Total liabilities   $ (5)
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Deferred compensation plan
Derivatives
Total assets
Financial liabilities    
Contingent consideration $ (2,974) $ (2,679)
Derivatives  
Total liabilities   $ (2,679)
Deferred compensation plan 6,357 6,237
Derivatives 296 32
Total assets 6,653 6,269
Contingent consideration $ (2,974) (2,679)
Derivatives   (5)
Total liabilities   $ (2,684)