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5. Inventories (Tables)
9 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
   December 31,   March 31, 
   2016   2016 
Raw materials  $1,369,000   $1,059,000 
Finished goods   697,000    536,000 
   $2,066,000   $1,595,000