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4. Inventories (Tables)
6 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
   September 30,   March 31, 
   2016   2016 
Raw materials  $1,392,000   $1,104,000 
Finished goods   693,000    536,000 
   $2,085,000   $1,640,000