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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Schedule of right-of-use assets of lease liabilities
   December 31, 
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
Amounts recognized in the consolidated balance sheet – right-of-use assets, net  $1,775   $1,290 
Current liabilities  $346   $292 
Long-term liabilities   1,492    983 
Total operating leased liabilities  $1,838   $1,275 
Schedule of weighted average lease term and weighted average discount rate
Weighted average lease term – operating lease   5.39 years
Weighted average discount rate – operating lease   7.07%
Schedule of cash flows related operating lease liabilities
   U.S. dollars
 in thousands		 
Years ending December 31:    
2021  $421 
2022   450 
2023   450 
2024   348 
2025   163 
Thereafter   360 
      
Total lease payments (undiscounted)   2,192 
Less – discount to net present value   (354)
Present value of lease liabilities  $1,838