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Note 13 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Employee Stock Option [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, Options, Grants in period, Weighted average grant date fair value $ 16.40 $ 24.54 $ 15.72 $ 24.54
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized $ 9,482   $ 9,482  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     2 years 4 months 24 days  
Share-based compensation arrangement by share-based payment award, Options, Exercises in period, Intrinsic value 77 $ 2,535 $ 166 $ 5,809
Share-based compensation arrangement by share-based payment award, Options, Outstanding, Intrinsic value 7,948   7,948  
Share-based compensation arrangement by share-based payment award options exercisable intrinsic value1 5,815   5,815  
Employee Stock Option [Member] | Selling, General and Administrative Expenses [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock or unit option plan expense 1,255 1,149 2,317 2,188
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized 1,285   $ 1,285  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     1 year 1 month 6 days  
Vesting period     2 years  
Restricted Stock [Member] | Cambrex Board of Directors [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period     6 months  
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Restricted stock or unit expense 354 177 $ 450 183
Performance Shares [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized 3,168   $ 3,168  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     1 year 4 months 24 days  
Performance Shares [Member] | Selling, General and Administrative Expenses [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance share expense (benefit) $ (54) $ 227 $ 447 $ 832