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Financial Instruments (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments (Textual)    
Cash and cash equivalents and short term deposits $ 4,395 $ 6,684
Loan to farm wave $ 2,000
Intangible asset discount rate 20.00%  
Bottom of range [member]    
Financial Instruments (Textual)    
Short term deposits fixed interest rate 0.02%  
Top of range [member]    
Financial Instruments (Textual)    
Short term deposits fixed interest rate 2.97%