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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2016
Selected Statement of Operations Data [Abstract]  
Schedule of accounts receivable, trade
   December 31, 
   2 0 1 6  2 0 1 5 
   U.S. dollars in 
   thousands 
        
 Open accounts $1,098  $2,488 
 Less - allowance for doubtful accounts *  -   (245)
   $1,098  $2,243 
          
 *    The changes in allowance for doubtful accounts are composed as follows:

 

   Years ended December 31, 
   2 0 1 6  2 0 1 5  2 0 1 4 
   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 6  2 0 1 5 
   U.S. dollars in 
   thousands 
        
 Government of Israel $10  $19 
 Employees  8   26 
 Sundry  158   168 
   $176  $213
Schedule of accounts payable and accruals - other
   December 31, 
   2 0 1 6  2 0 1 5 
   U.S. dollars in 
   thousands 
        
 Payroll and related expenses $702  $964 
 Government institutions  348   1,166 
 Accrued vacation pay  67   63 
 Accrued expenses and sundry  116   71 
   $1,233  $2,264