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7. COMMITMENTS AND CONTINGENCIES - Royalties and Product Warranties (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
COMMITMENTS AND CONTINGENCIES.      
Royalty expense $ 35,000 $ 44,000 $ 53,000
Product warranties      
Warranty period 3 years