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Leases (Tables)
 12 Months Ended
Dec. 31, 2022
Leases [Abstract]  
Schedule of right-of-use assets of lease liabilities
   December 31, 
   2 0 2 2   2 0 2 1 
   U.S. dollars in thousands 

Amounts recognized in the consolidated balance sheet – right-of-use assets, net

  $946   $1,463 
 Current liabilities  $271   $376 
Long-term liabilities   615    1,098 
Total operating leased liabilities  $886   $1,474 

 
Schedule of weighted average lease term and weighted average discount rate
Weighted average lease term – operating lease  4.28 years 
Weighted average discount rate – operating lease   6.9%

 
Schedule of cash flows related operating lease liabilities
   U.S. dollars
in thousands		 
Years ending December 31:    
2023  $294 
2024   248 
2025   146 
2026   142 
2027   142 
Thereafter   38 
Total lease payments (undiscounted)   1,010 
Less – discount to net present value   (124)
Present value of lease liabilities  $886