Annual report pursuant to Section 13 and 15(d)

Short-Term Borrowings and Credit Lines (Narrative) (Details)

v3.3.1.900
Short-Term Borrowings and Credit Lines (Narrative) (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
JPY (¥)
Dec. 31, 2015
CAD
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]          
Proceeds from Lines of Credit $ 1,940,000        
Line of credit facility amount outstanding 1,940,000       $ 0
Available credit amount 125,000,000        
Domestic [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility amount outstanding $ 0       0
Canadian Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Interest rate description Canadian prime rate        
Line of credit facility amount outstanding $ 0       0
Maximum borrowing capacity 21,678,000     CAD 30,000,000  
European Subsidiary [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility amount outstanding 0       0
European Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 33,456,000        
European Subsidiary [Member] | European Customs Guaranteed Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 2,308,000        
European Subsidiary [Member] | Unsecured And Uncommitted Credit Line1 [Member]          
Line of Credit Facility [Line Items]          
Interest rate description European Central Bank ("ECB") refinancing rate plus 50 basis points        
Maximum borrowing capacity | €   € 25,800,000      
European Subsidiary [Member] | Unsecured And Uncommitted Credit Line2 [Member]          
Line of Credit Facility [Line Items]          
Interest rate description Euro Overnight Index Average ("EONIA") plus 75 basis points        
Maximum borrowing capacity | €   € 5,000,000      
Japanese Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 9,495,000        
Japanese Subsidiary [Member] | Unsecured And Uncommitted Credit Line1 [Member]          
Line of Credit Facility [Line Items]          
Interest rate description JPY LIBOR plus 100 basis points        
Maximum borrowing capacity $ 7,000,000        
Japanese Subsidiary [Member] | Unsecured And Uncommitted Credit Line2 [Member]          
Line of Credit Facility [Line Items]          
Interest rate description Bank of Tokyo Prime Rate        
Maximum borrowing capacity | ¥     ¥ 300,000,000    
Japanese Subsidiary [Member] | Revolving Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility amount outstanding $ 0       0
Korean Subsidiary [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility amount outstanding $ 0       $ 0
Korean Subsidiary [Member] | Unsecured And Uncommitted Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Interest rate description CD rate plus 220 basis points        
Maximum borrowing capacity $ 20,000,000        
Committed Portion Of Credit Facility [Member] | Domestic [Member]          
Line of Credit Facility [Line Items]          
Maturity date of agreement Jul. 01, 2020        
Minimum [Member] | Domestic [Member] | Committed Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Interest rate description USD LIBOR plus 87.5 basis points        
Maximum [Member] | Domestic [Member] | Committed Line Of Credit [Member]          
Line of Credit Facility [Line Items]          
Interest rate description USD LIBOR plus 162.5 basis points