Summary of Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Summary of Accounting Policies (Details) [Line Items]
Revenues	$ 54,254	$ 41,507
POC Revenue [Member]
Summary of Accounting Policies (Details) [Line Items]
Revenues	$ 50,200	$ 38,000
Building [Member]
Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Minimum [Member] | Other Depreciable Assets [Member]
Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Other Depreciable Assets [Member]
Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years