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Financing Arrangements (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
note
May 31, 2023
USD ($)
Oct. 31, 2019
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Number of long term notes | note 2      
Unsecured note $ 22,860,000      
Unsecured Debt        
Debt Instrument [Line Items]        
Current portion of long-term note $ 1,188,000      
Unsecured Debt | Scenario, Forecast        
Debt Instrument [Line Items]        
Amount due on long-term note   $ 15,438,000    
Unsecured Debt | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.20%      
Unsecured Debt | Interest rate swap        
Debt Instrument [Line Items]        
Derivative, fixed interest rate 2.85%      
Secured Debt        
Debt Instrument [Line Items]        
Amount due on long-term note $ 17,167,000      
Current portion of long-term note $ 2,000,000      
Interest rate percentage 2.81%      
Secured Debt | Scenario, Forecast        
Debt Instrument [Line Items]        
Amount due on long-term note     $ 12,000,000  
U.S. line-of-credit        
Debt Instrument [Line Items]        
Line of credit $ 0     $ 0
Guarantees issued 22,000     2,828,000
Euro line-of-credit        
Debt Instrument [Line Items]        
Line of credit 0     0
Guarantees issued 12,716,000     $ 8,221,000
Long-term notes        
Debt Instrument [Line Items]        
Amount due on long-term note 40,027,000      
Current portion of long-term note $ 3,188,000