Annual report pursuant to Section 13 and 15(d)

Disclosure - Summary of Significant Accounting Policies - Accounts receivable (Details)

v3.5.0.2
Disclosure - Summary of Significant Accounting Policies - Accounts receivable (Details) - USD ($)
Apr. 30, 2016
Apr. 30, 2015
Accounting Policies [Abstract]    
Trade receivables $ 2,656,000 $ 2,151,000
VAT receivable 190,000 160,000
Allowance for doubtful accounts and sales returns (100,000) (140,000)
Accounts receivable $ 2,746,000 $ 2,171,000