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Loans Payable - Banks (Details Narrative)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Foreign Subsidiaries [Member]  
Line of Credit Facility [Line Items]  
Line of credit, maximum borrowing amount $ 30,000
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member]  
Line of Credit Facility [Line Items]  
Variable rate 0.19%
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member] | Minimum [Member]  
Line of Credit Facility [Line Items]  
Basis spread over variable interest rate 0.50%
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member] | Maximum [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 $ 20,000
Maturity Dec. 18, 2018
Parent and Domestic Subsidiaries [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Line of Credit Facility [Line Items]  
Basis spread over variable interest rate 2.00%
Variable rate 1.56%