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Financing Arrangements (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
credit_line
May 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
Dec. 31, 2018
EUR (€)
credit_line
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]          
Current portion of long-term debt $ 3,671,000       $ 3,604,000
Long-Term Note          
Line of Credit Facility [Line Items]          
Long-term debt 45,378,000       48,982,000
Current portion of long-term debt 3,671,000       $ 3,604,000
Unsecured Debt          
Line of Credit Facility [Line Items]          
Notes payable 20,781,000        
Notes payable, current 1,188,000        
Unsecured Debt | Scenario, Forecast          
Line of Credit Facility [Line Items]          
Notes payable   $ 15,438,000      
Secured Debt          
Line of Credit Facility [Line Items]          
Notes payable 24,597,000        
Notes payable, current $ 2,483,000        
Interest rate 2.74%     2.74%  
Secured Debt | Scenario, Forecast          
Line of Credit Facility [Line Items]          
Notes payable     $ 15,375,000    
London Interbank Offered Rate (LIBOR) | Unsecured Debt          
Line of Credit Facility [Line Items]          
Spread on variable rate 1.20%        
U S Line Of Credit          
Line of Credit Facility [Line Items]          
Line of credit $ 0        
Guarantees issued $ 930,000        
US Long Term Note          
Line of Credit Facility [Line Items]          
Debt service coverage ratio 1.5        
Maximum indebtedness against EBITDA 3        
US Long Term Note | Minimum          
Line of Credit Facility [Line Items]          
Covenant, debt service coverage $ 50,000        
US Long Term Note | Maximum          
Line of Credit Facility [Line Items]          
Covenant, debt service coverage 250,000        
Euro Line Of Credit          
Line of Credit Facility [Line Items]          
Line of credit 0        
Guarantees issued 1,166,000        
Other European Facilities          
Line of Credit Facility [Line Items]          
Borrowing capacity $ 2,289,000     € 2,000,000  
Number of credit lines | credit_line 2     2  
Letter of Credit | U S Line Of Credit          
Line of Credit Facility [Line Items]          
Borrowing capacity $ 50,000,000        
Remaining borrowing capacity $ 49,070,000        
Letter of Credit | U S Line Of Credit | Minimum | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Spread on variable rate 0.80%        
Letter of Credit | U S Line Of Credit | Maximum | London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Spread on variable rate 1.20%        
Letter of Credit | Euro Line Of Credit          
Line of Credit Facility [Line Items]          
Borrowing capacity $ 57,219,000     € 50,000,000  
Remaining borrowing capacity 56,053,000        
Letter of Credit | Other European Facilities          
Line of Credit Facility [Line Items]          
Line of credit 0        
Remaining borrowing capacity $ 2,289,000        
Interest rate swap | Unsecured Debt          
Line of Credit Facility [Line Items]          
Fixed interest rate 2.85%     2.85%