| 
                Total assets
             | 
                        
                18.2M
             | 
                        
                22.7M
             | 
                        
                27.0M
             | 
                        
                30.5M
             | 
                    
                
                        | 
                Current assets
             | 
                        
                18.2M
             | 
                        
                22.7M
             | 
                        
                27.0M
             | 
                        
                30.5M
             | 
                    
                
                        | 
                Cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash equivalents
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Cash and cash equivalents
             | 
                        
                16.4M
             | 
                        
                20.8M
             | 
                        
                25.2M
             | 
                        
                29.7M
             | 
                    
                
                        | 
                Other short term investments
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accounts receivable
             | 
                        
                18K
             | 
                        
                18K
             | 
                        
                18K
             | 
                        
                17K
             | 
                    
                
                        | 
                Other receivables
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Inventory
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Prepaid assets
             | 
                        
                1.5M
             | 
                        
                1.4M
             | 
                        
                1.4M
             | 
                        
                440K
             | 
                    
                
                        | 
                Restricted cash
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Assets held for sale
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Hedging assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other current assets
             | 
                        
                263K
             | 
                        
                401K
             | 
                        
                303K
             | 
                        
                264K
             | 
                    
                
                        | 
                Non current assets
             | 
                        
                19K
             | 
                        
                23K
             | 
                        
                27K
             | 
                        
                18K
             | 
                    
                
                        | 
                Properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Land and improvements
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Machinery furniture equipment
             | 
                        
                —
             | 
                        
                84K
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Construction in progress
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Leases
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Accumulated depreciation
             | 
                        
                -66K
             | 
                        
                -62K
             | 
                        
                -58K
             | 
                        
                -53K
             | 
                    
                
                        | 
                Goodwill
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Investment properties
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Financial assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Intangible assets
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Investments and advances
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current assets
             | 
                        
                1K
             | 
                        
                1K
             | 
                        
                1K
             | 
                        
                1K
             | 
                    
                
                        | 
                Total liabilities
             | 
                        
                12.2M
             | 
                        
                12.0M
             | 
                        
                12.5M
             | 
                        
                11.6M
             | 
                    
                
                        | 
                Current liabilities
             | 
                        
                9.4M
             | 
                        
                9.2M
             | 
                        
                9.7M
             | 
                        
                8.7M
             | 
                    
                
                        | 
                Accounts payable
             | 
                        
                6.6M
             | 
                        
                5.6M
             | 
                        
                6.1M
             | 
                        
                5.1M
             | 
                    
                
                        | 
                Accrued expenses
             | 
                        
                2.2M
             | 
                        
                2.4M
             | 
                        
                2.4M
             | 
                        
                2.6M
             | 
                    
                
                        | 
                Short term debt
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Deferred revenue
             | 
                        
                226K
             | 
                        
                226K
             | 
                        
                226K
             | 
                        
                226K
             | 
                    
                
                        | 
                Tax payable
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Pensions
             | 
                        
                457K
             | 
                        
                1.0M
             | 
                        
                854K
             | 
                        
                742K
             | 
                    
                
                        | 
                Other current liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Non current liabilities
             | 
                        
                2.7M
             | 
                        
                2.8M
             | 
                        
                2.8M
             | 
                        
                2.9M
             | 
                    
                
                        | 
                Long term provisions
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Long term debt
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Provision for risks and charges
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Deferred liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Derivative product liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Other non current liabilities
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Shareholders equity
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                        
                
             | 
                    
                
                        | 
                Common stock
             | 
                        
                211K
             | 
                        
                210K
             | 
                        
                210K
             | 
                        
                210K
             | 
                    
                
                        | 
                Retained earnings
             | 
                        
                -487.6M
             | 
                        
                -482.6M
             | 
                        
                -478.4M
             | 
                        
                -473.7M
             | 
                    
                
                        | 
                Other shareholders equity
             | 
                        
                -30K
             | 
                        
                -23K
             | 
                        
                -30K
             | 
                        
                -28K
             | 
                    
                
                        | 
                Total shareholders equity
             | 
                        
                6.0M
             | 
                        
                10.7M
             | 
                        
                14.5M
             | 
                        
                18.9M
             | 
                    
                
                        | 
                Additional paid in capital
             | 
                        
                493.4M
             | 
                        
                493.1M
             | 
                        
                492.8M
             | 
                        
                492.4M
             | 
                    
                
                        | 
                Treasury stock
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                    
                
                        | 
                Minority interest
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             | 
                        
                —
             |