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Note 4 - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Deferred compensation plan $ 5,558 $ 4,953
Derivatives    
Total assets $ 5,558 $ 4,953
Financial liabilities    
Contingent consideration    
Derivatives    
Total liabilities    
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Deferred compensation plan $ 1,274 $ 1,284
Derivatives 94 32
Total assets $ 1,368 $ 1,316
Financial liabilities    
Contingent consideration    
Derivatives $ (47) $ (5)
Total liabilities $ (47) $ (5)
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Deferred compensation plan    
Derivatives    
Total assets    
Financial liabilities    
Contingent consideration $ (2,741) $ (2,679)
Derivatives    
Total liabilities $ (2,741) $ (2,679)
Deferred compensation plan 6,832 6,237
Derivatives 94 32
Total assets 6,926 6,269
Contingent consideration (2,741) (2,679)
Derivatives (47) (5)
Total liabilities $ (2,788) $ (2,684)