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Financial Instruments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Increase (decrease) through foreign exchange, financial assets $ 1,845 $ 1,593
Liquidity risk [member]    
Interest rate, significant unobservable inputs, assets 28.00%  
Floating interest rate [member]    
Borrowings, adjustment to interest rate basis 0.25%  
Increase or decrease net profit through interest rate $ 243 $ 193