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Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventories

The components of inventories are as follows:

    March 31,
    2020   2021
    $ in thousands   $ in thousands
         
Raw materials     357       267  
Work in progress     429       391  
Finished goods     392       439  
                 
      1,178       1,097