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Long-term debt consists of the following: (Details)
Number in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Number
Dec. 31, 2023
EUR (€)
Number
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Apr. 30, 2021
USD ($)
Apr. 30, 2021
EUR (€)
Debt Instrument [Line Items]            
Debt Instrument, Face Amount | €   € 80,000,000        
Loan payable $ 157,484,000   $ 180,041,000      
Less current maturities 29,587,000   28,547,000      
Total 127,897,000   151,494,000      
Loans Payable [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 55,300,000   55,300,000 € 50,000,000    
Number of installments | Number 48 48        
Installment amount (in Dollars) $ 1,100,000          
Interest per annum 0.825% 0.825%        
Loan payable $ 40,334,000   52,061,000      
Loans Payable One [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 132,600,000       $ 132,600,000 € 120,000,000
Number of installments | Number 120 120        
Installment amount (in Dollars) $ 1,100,000          
Interest per annum 0.75% 0.75%        
Loan payable $ 95,576,000   104,758,000      
Loans Payable Two [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 15,000,000          
Number of installments | Number 14 14        
Installment amount (in Dollars) $ 1,100,000          
Interest per annum 4.10% 4.10%        
Loan payable $ 9,172,000   9,890,000      
Loans Payable Three [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 17,000,000          
Number of installments | Number 10 10        
Installment amount (in Dollars) $ 1,700,000          
Interest per annum 2.00% 2.00%        
Loan payable $ 12,402,000   $ 13,332,000