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Deferred Revenues (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Text Block [Abstract]  
Schedule of deferred revenues
   December 31 
   2020   2019 
         
Advanced payments from customers   267    210 
Service contracts   544    483 
Other   93    143 
    904    836 
Less- long term deferred revenue related to service contract   (303)   (319)
   $601   $517