• Filing Date: 2019-07-11
  • Form Type: 10-K
  • Description: Annual report
v3.19.2
Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Income Tax Expense (Benefit) $ 0 $ 0
Tax (recovery) based on U.S. rates [Member]    
Income Tax Expense (Benefit) (1,053,000) (957,000)
Foreign tax rate differential [Member]    
Income Tax Expense (Benefit) 32,000 (20,000)
Non-deductible stock option compensation [Member]    
Income Tax Expense (Benefit) 101,000 182,000
Effect of reduction (increase) in statutory rates [Member]    
Income Tax Expense (Benefit) (203,000) 6,648,000
Foreign exchange losses on revaluation of deferred tax balances [Member]    
Income Tax Expense (Benefit) 411,000 (464,000)
Under provision relating to prior year [Member]    
Income Tax Expense (Benefit) (380,000) (72,000)
Expiry of non-operating losses [Member]    
Income Tax Expense (Benefit) 0 706,000
Increase in valuation allowance [Member]    
Income Tax Expense (Benefit) $ 1,092,000 $ (6,023,000)