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4. Condensed Consolidated Balance Sheets (Tables)
9 Months Ended
Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]  
Inventories
   December 31,   March 31, 
   2015   2015 
Raw materials  $1,096,000   $865,000 
Finished goods   517,000    537,000 
   $1,613,000   $1,402,000