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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplementary Balance Sheet Information [Abstract]  
Schedule of accounts receivable, trade
   December 31, 
   2 0 1 7  2 0 1 6 
   U.S. dollars in 
   thousands 
        
 Open accounts $524  $1,098 
 Less - allowance for doubtful accounts *  -   - 
   $524  $1,098 

 

 *The changes in allowance for doubtful accounts are composed as follows:

 

   Years ended December 31, 
   2 0 1 7  2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
           
 Balance at beginning of year  -  $245  $- 
 Increase (decrease) during the year  -   (245)  245 
 Balance at end of year $-  $-  $245 
Schedule of accounts receivable, other
   December 31, 
   2 0 1 7  2 0 1 6 
   U.S. dollars in 
   thousands 
        
 Government of Israel $659  $10 
 Employees  25   8 
 Sundry  159   158 
   $843  $176 
Schedule of accounts payable and accruals - other
   December 31, 
   2 0 1 7  2 0 1 6 
   U.S. dollars in 
   thousands 
        
 Payroll and related expenses $507  $702 
 Government institutions  208   348 
 Accrued vacation pay  52   67 
 Accrued expenses and sundry  70   116 
   $837  $1,233