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5. Inventories (Tables)
12 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
   March 31, 
   2019   2018 
Raw materials  $1,766,000   $1,619,000 
Finished goods   1,643,000    1,246,000 
   $3,409,000   $2,865,000