operating leases for real estate locations (Details)	6 Months Ended
	Oct. 31, 2021 USD ($)
Operating Lease Location 1 [Member]
Operating Lease, Expense	$ 11,000
Operating Lease Location 2 [Member]
Operating Lease, Expense	4,600
Operating Lease Location 3 [Member]
Operating Lease, Expense	3,438
Operating Lease Location 4 [Member]
Operating Lease, Expense	2,667
Operating Lease Location 5 [Member]
Operating Lease, Expense	1,690
Operating Lease Location 6 [Member]
Operating Lease, Expense	$ 1,445