Fair Value Measurements (Tables)

3 Months Ended

Jul. 31, 2019

Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]

		Carrying			Fair Value
As at July 31, 2019		Amount		Fair Value	Levels	Reference
Assets
Cash	$	1,223,953	$	1,223,953	1	N/A
Foreign currency option contracts		4,800		4,800	2	Note 5
	$	1,228,753	$	1,228,753
Liabilities
Foreign currency option contracts	$	7,614	$	7,614	2	Note 5

		Carrying			Fair Value
As at April 30, 2019		Amount		Fair Value	Levels	Reference
Assets
Cash	$	1,862,458	$	1,862,458	1	N/A
Foreign currency option contracts		1,178		1,178	2	Note 5
	$	1,863,636	$	1,863,636
Liabilities
Foreign currency option contracts	$	4,512	$	4,512	2	Note 5

Schedule of Assets and Liabilities Not Measured at Fair Value [Table Text Block]

		Carrying			Fair Value
As at July 31, 2019		Amount		Fair Value	Levels	Reference
Loan payable	$	3,000,000	$	2,615,606	2	Note 7