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Inventories (Tables)
12 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of inventories
          
   March 31, 
   2022   2021 
Raw materials  $1,626,000   $1,670,000 
Finished goods   1,037,000    860,000 
Inventories, net  $2,663,000   $2,530,000