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Financial Instruments - Fair Values and Risk Management - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 01, 2021
EUR (€)
Feb. 28, 2021
EUR (€)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Jul. 31, 2020
EUR (€)
Jun. 30, 2020
EUR (€)
Dec. 31, 2020
EUR (€)
Customer
Dec. 31, 2019
EUR (€)
Customer
Dec. 31, 2018
EUR (€)
Customer
Disclosure of detailed information about financial instruments [line items]                  
Transfers between Level 1 and Level 2, assets             € 0 € 0  
Transfers between Level 1 and Level 2, liabilities             0 0  
Transfers between Level 2 and Level 1, assets             0 0  
Transfers between Level 2 and Level 1, liabilities             0 0  
Transfers into Level 3, assets             0 0  
Transfers out of Level 3, assets             0 0  
Transfers into Level 3, liabilities             0 0  
Transfers out of Level 3, liabilities             0 0  
Current and non-current receivables       € 2,418,000     2,418,000 1,780,000  
Cash and cash equivalents       48,187,000     48,187,000 39,799,000  
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  
Unused credit lines       € 23,916,000     € 23,916,000    
Fixed rate borrowings [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Borrowings interest rate       57.90%     57.90% 49.90%  
Disposal of major subsidiary [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Purchase price adjustments on cash consideration € 1,800,000                
Disposal of major subsidiary [member] | IMPE S.p.A. [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Proceeds from sale of interests in subsidiary € 6,100,000 € 4,900,000              
Events After Reporting Period | Romanian Financial Institution                  
Disclosure of detailed information about financial instruments [line items]                  
Long-term loan     € 5,000,000            
Long-term debt interest rate basis     six-month Euribor (360)            
Long-term debt interest rate spread     2.75%            
Land [Member]                  
Disclosure of detailed information about financial instruments [line items]                  
Cash consideration received for asset disposal           € 2,800,000      
Receivables from sale of properties, period           2 years      
Additional consideration receivable from asset sale           € 2,500,000      
Industrial Real Estate Complex [member] | Non-current Assets Held For Sale [member]                  
Disclosure of detailed information about financial instruments [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 detailed information about financial instruments [line items]                  
Cash consideration on disposal of non-current assets held for sale     € 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.    
Trade receivables [member]                  
Disclosure of detailed information about financial instruments [line items]                  
No. of customers | Customer             0 0  
Revenue [member]                  
Disclosure of detailed information about financial instruments [line items]                  
No. of customers | Customer             0 0 0
Percentage of concentration risk       5.00%     5.00% 5.00% 5.00%
Credit risk [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Percentage of uncollected outstanding balances of trade receivable in case of customer insolvency       85.00%     85.00%    
Percentage of insured trade receivables       15.00%     15.00%    
Current and non-current receivables       € 13,197,000     € 13,197,000 € 12,242,000  
Liquidity risk [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Additional renewal term of factoring agreement         5 years        
Bottom Of Range [Member]                  
Disclosure of detailed information about financial instruments [line items]                  
Maximum payment period for individual customers             30 days    
Borrowings interest rate       3.00%     3.00% 3.00%  
Bottom Of Range [Member] | Trade receivables [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Percentage of concentration risk       5.00%     5.00% 5.00%  
Top of range [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Maximum payment period for individual customers             90 days    
Temporarily extended payment period for certain customers             120 days    
Borrowings interest rate       12.00%     12.00% 12.00%  
Top of range [member] | Liquidity risk [member]                  
Disclosure of detailed information about financial instruments [line items]                  
Short-term borrowings         € 40,000,000