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3. TRADE AND OTHER RECEIVABLES (Details) - USD ($)
Jan. 31, 2018
Apr. 30, 2017
Receivables [Abstract]    
Trade receivables [1] $ 7,967,000 $ 7,274,000
Other receivables 0 468,000
Total trade and other receivables $ 7,967,000 $ 7,742,000
[1] Represents amounts billed for contract manufacturing services provided by Avid.