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Deferred Revenues (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure Text Block [Abstract]  
Schedule of deferred revenues
   December 31 
   2021   2020 
         
Advanced payments from customers   317    267 
Service contracts   490    544 
Other   242    93 
    1,049    904 
Less- long term deferred revenue related to service contract   (132)   (303)
   $917   $601