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Note 13 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 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     $ 15.72 $ 24.54
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized $ 8,089   $ 8,089  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     2 years 2 months 12 days  
Share-based compensation arrangement by share-based payment award, Options, Exercises in period, Intrinsic value 2,264 $ 12,685 $ 2,430 $ 18,494
Share-based compensation arrangement by share-based payment award, Options, Outstanding, Intrinsic value 18,677   18,677  
Share-based compensation arrangement by share-based payment award options exercisable intrinsic value1 8,980   8,980  
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 1,294 994 3,611 3,182
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 826   $ 826  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     9 months 18 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 459 262 $ 909 445
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 2,480   $ 2,480  
Employee service share-based compensation, Nonvested awards, Compensation cost not yet recognized, Period for recognition     1 year 2 months 12 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) $ (2) $ (353) $ 445 $ 479