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General principles for the preparation of the consolidated financial statements - Additional Information (Detail) - EUR (€)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Jan. 08, 2021
Mar. 31, 2021
Dec. 31, 2020
Jul. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Cash and cash equivalents       € 48,187,000                 € 48,187,000 € 39,799,000  
Unused credit facility       23,916,000                 € 23,916,000 24,251,000  
Decrease in consolidated net sales percentage               33.20% 22.30%            
Decrease in revenue percentage                   27.40%          
Percentage of revenue from group                         15.10%    
Revenue                         € 328,343,000 386,962,000 € 428,539,000
Percentage of revenue expected decrease from group             20.00%                
Profit loss                         24,906,000 33,680,000 (33,119,000)
Operating profit                         10,605,000 22,488,000 25,458,000
Net cash used in operating activities                         12,268,000 4,652,000 (11,348,000)
Actual outstanding order backlog amount       103,000,000                 € 103,000,000    
Increase decrease in percentage of outstanding order backlog                         75.00%    
Cash consideration received for asset disposal                         € 2,888,000 66,000 € 572,000
Long-term loan       16,426,000                 16,426,000 € 18,412,000  
Events After Reporting Period                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Increase Decrease in Percentage of Entity's Revenue                     2.70% 25.00%      
Events After Reporting Period | Romanian Financial Institution                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Long-term loan € 5,000,000   € 5,000,000                        
Long-term debt interest rate basis     six-month Euribor (360)                        
Long-term debt interest rate spread 2.75%   2.75%                        
Disposal Groups Classified as Held For Sale [member] | Classification of Assets as Held For Sale [member] | 'COVID19 [Member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Disposal group assets held for sale cash consideration received € 11,150,000                            
Disposal Groups Classified as Held For Sale [member] | Vita Group [member] | Share Sell and Purchase Agreement [member] | IMPE S.p.A. [member] | Classification of Assets as Held For Sale [member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Disposal group assets held for sale, consideration agreed   € 6,100,000                          
Disposal group assets held for sale purchase price adjustments   1,800,000                          
Disposal group assets held for sale cash consideration received   € 4,900,000                          
Land [Member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Cash consideration received for asset disposal           € 2,800,000                  
Additional consideration receivable from asset sale           € 2,500,000   € 2,500,000   € 2,500,000          
Receivables from sale of properties, period           2 years                  
Industrial Real Estate Complex [member] | Non-current Assets Held For Sale [member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Cash consideration on disposal of non-current assets held for sale       1,300,000                 1,300,000    
Industrial Real Estate Complex [member] | Non-current Assets Held For Sale [member] | Classification of Assets as Held For Sale [member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Cash consideration on disposal of non-current assets held for sale € 1,250,000   € 1,250,000 € 1,300,000                 € 1,300,000    
Description of non-current asset or disposal group held for sale which were sold or reclassified     Parent signed the sale contract with a third party for the disposal of the idle industrial real estate complex “Fornello” located in the city of Altamura (Bari), just a few miles away from its headquarters. Parent signed the preliminary agreement with a third party for the disposal of the idle industrial real estate complex “Via Dell’Avena” located in the city of Altamura (Bari), just a few miles away from its headquarters                 Parent signed the sale contract with a third party for the disposal of the idle industrial real estate complex “Fornello”, located in the city of Altamura (Bari), just a few miles away from its headquarters.    
Liquidity risk [member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Percentage of guaranteed nominal amount         90.00%                    
Long term borrowing nominal amount         € 40,000,000                    
Additional renewal term of factoring agreement         5 years                    
Liquidity risk [member] | Top of range [member]                              
Disclosure of general principles for the preparation of the consolidated financial statements [Line Items]                              
Short-term borrowings         € 40,000,000