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Loans Payable - Banks (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Weighted average interest rate on short-term borrowings 0.00% 0.00%
Foreign Subsidiaries [Member]    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing amount $ 26.0  
Line of credit, amount outstanding $ 0.0 $ 0.0
Foreign Subsidiaries [Member] | EURIBOR [Member]    
Line of Credit Facility [Line Items]    
Variable rate 0.08%  
Foreign Subsidiaries [Member] | Minimum [Member] | EURIBOR [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 0.50%  
Foreign Subsidiaries [Member] | Maximum [Member] | EURIBOR [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 0.80%  
Parent and Domestic Subsidiaries [Member]    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing amount $ 20.0  
Line of credit, amount outstanding $ 0.0 $ 0.0
Maturity Dec. 18, 2017  
Parent and Domestic Subsidiaries [Member] | Prime Rate [Member]    
Line of Credit Facility [Line Items]    
Basis spread over variable interest rate 0.50%  
Variable rate 3.75%