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4. Condensed Consolidated Balance Sheets (Tables)
6 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories
   September 30,   March 31, 
   2018   2018 
Raw materials  $1,811,000   $1,619,000 
Finished goods   1,142,000    1,246,000 
   $2,953,000   $2,865,000