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4. Inventories (Tables)
3 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventories
   June 30,   March 31, 
   2016   2016 
Raw materials  $1,218,000   $1,104,000 
Finished goods   774,000    536,000 
   $1,992,000   $1,640,000