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FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Gross carrying amounts by credit-risk rating classes (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Stage 3 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets € (11,459) € (5,473)
Stage 1 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 1,574 3,791
Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 17,622 18,635
Cash and cash equivalents | AAA to BBB (Investment grade) | Stage 1 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 1,574 3,791
Shareholder receivable | BBB- to CCC (Below investment grade) | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets   4,711
Trade receivables and other receivables | Stage 3 | Allowances    
Credit-risk rating    
Carrying amount, financial assets (11,459) (5,473)
Trade receivables and other receivables | Current (not past due) | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 14,538 9,829
Trade receivables and other receivables | 1-30 days past due | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 434 919
Trade receivables and other receivables | 31-60 days past due | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 550 294
Trade receivables and other receivables | 61-90 days past due | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets 177 60
Trade receivables and other receivables | More than 90 days past due | Stage 2 | Gross carrying amounts    
Credit-risk rating    
Carrying amount, financial assets € 1,924 € 2,822